Fix PrismJS#1601 Allow strings to have trailing comments

Updates the string regex to allow for strings that may have a trailing '#'.
This uses a different pattern from other regex patterns, because only
the string regex pattern is greedy, while the others are not.

components/prism-yaml.js

@@ -31,7 +31,7 @@ Prism.languages.yaml = {
 		alias: 'important'
 	},
 	'string': {
-		pattern: /([:\-,[{]\s*(?:![^\s]+)?[ \t]*)("|')(?:(?!\2)[^\\\r\n]|\\.)*\2(?=[ \t]*(?:$|,|]|}))/m,
+		pattern: /([:\-,[{]\s*(?:![^\s]+)?[ \t]*)("|')(?:(?!\2)[^\\\r\n]|\\.)*\2(?=[ \t]*(?:$|,|]|}|(\s*#)))/m,
 		lookbehind: true,
 		greedy: true
 	},