add a simple return, ie the normal kind, not with trailing statements

lib/parser/README.markdown

@@ -6,6 +6,7 @@ This includes the parser and generated ast.
 Parslet is really great in that it:
 - does not generate code but instean gives a clean dsl to define a grammar
 - uses ruby modules so one can split the grammars up
+- has support for binary operators with presedence and binding
 - has a seperate tranform stage to generate an ast layer
 
 Especially the last point is great. Since it is seperate it does not clutter up the actual grammar.