Fixed issue which caused error to be thrown when file content ended with...

... a } and other similar characters like ) or ]...
The postpend string starts with a var declaration so for example if the postpend string got appended to code such as "var foo = function () { return 'foo'; }" you would get "var foo = function { return 'foo'; } var ..." Which throws an error - You need either a new line or a ; after the } for it to work. A new line might have messed up the source mapping so ; was the natural choice :)