README.md: Mention about Xfce support

README.md

@@ -3,7 +3,7 @@

                                
                                
                                
                            
                                
                                    
                                        
                                            3  
                                            ![widget-factory](../images/widget-factory.png?raw=true)
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            4  
                                            
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            5  
                                            Materia (formerly Flat-Plat) is a [Material Design](https://material.io) theme for GNOME/GTK+ based desktop environments.  
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        6 -
                                        It supports GTK+ 3, GTK+ 2, GNOME Shell, Budgie, Cinnamon, MATE, Unity, LightDM, GDM, Chrome theme, etc.
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        6 +
                                        It supports GTK+ 3, GTK+ 2, GNOME Shell, Budgie, Cinnamon, MATE, Unity, Xfce, LightDM, GDM, Chrome theme, etc.
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            7  
                                            
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            8  
                                            Also Materia can be customized with [oomox theme designer](https://github.com/themix-project/oomox).
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            9  
                                            
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        

@@ -35,6 +35,7 @@ Various **desktop environments** are supported:

                                
                                
                                
                            
                                
                                    
                                        
                                            35  
                                            - Cinnamon `>=3.x`
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            36  
                                            - MATE `>=1.14`
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            37  
                                            - Unity `>=7.4`
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        38 +
                                        - Xfce `>=4.13`
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            39  
                                            
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            40  
                                            ## Requirements
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            41