Update README with developing instructions.

StanAngeloff · StanAngeloff · commit ae939a7800ce · 2017-01-05T12:09:07.000+02:00
diff --git a/README.md b/README.md
@@ -45,8 +45,10 @@ augroup END
 
 <center>![Overriding Highlighting](http://i.imgur.com/eAlB1eb.png)</center>
 
-Updating
---------
+Developing
+----------
+
+When you install `php.vim` using your preferred installation method, all the files needed are already in place.
 
 The project comes with a Dockerfile which can be used to rebuild the syntax file.
 
