Add 'prototype' keyword for JavaScript

data/filetypes.javascript

@@ -3,7 +3,7 @@
 
 [keywords]
 # all items must be in one line
-primary=break case catch const continue default delete do each else false finally for function get if in Infinity instanceof let NaN new null return set switch this throw true try typeof undefined var void while with yield
+primary=break case catch const continue default delete do each else false finally for function get if in Infinity instanceof let NaN new null return set switch this throw true try typeof undefined var void while with yield prototype
 secondary=Array Boolean Date Function Math Number Object String RegExp EvalError Error RangeError ReferenceError SyntaxError TypeError URIError prototype decodeURI decodeURIComponent encodeURI encodeURIComponent eval isFinite isNaN parseFloat parseInt
 
 [settings]