Build: Lint the minified jQuery file as well - a Gruntfile fix

While we have absolutely no style-related expectations to our minified file,
we do care that it's valid ES 5.1. This is now verified.

Fixes gh-3075
Ref gh-4594
Closes gh-4598

Gruntfile.js

@@ -85,7 +85,7 @@ module.exports = function( grunt ) {
 			// We have to explicitly declare "src" property otherwise "newer"
 			// task wouldn't work properly :/
 			dist: {
-				src: "dist/jquery.js"
+				src: [ "dist/jquery.js", "dist/jquery.min.js" ]
 			},
 			dev: {
 				src: [ "src/**/*.js", "Gruntfile.js", "test/**/*.js", "build/**/*.js" ]