JS Extras: Added control-flow keywords (#2529)

Author: RunDevelopment

components/prism-js-extras.js

@@ -37,6 +37,10 @@
 			pattern: /\b(?:as|default|export|from|import)\b/,
 			alias: 'module'
 		},
+		{
+			pattern: /\b(?:await|break|catch|continue|do|else|for|finally|if|return|switch|throw|try|while|yield)\b/,
+			alias: 'control-flow'
+		},
 		{
 			pattern: /\bnull\b/,
 			alias: ['null', 'nil']