Disallow newlines in hashtag

src/lib/constants.js

@@ -43,7 +43,7 @@ let constants = {
 		timeline_fetch_first: 12,
 		username_regex: "[\\w.]+",
 		shortcode_regex: "[\\w-]+",
-		hashtag_regex: "[^ `~!@#\\$%^&*()\\-=+[\\]{};:\"',<.>/?\\\\]+"
+		hashtag_regex: "[^ \\n`~!@#\\$%^&*()\\-=+[\\]{};:\"',<.>/?\\\\]+"
 	},
 
 	resources: {