[refactor] version bump manifest

Author: zombieFox

src/manifest.json

@@ -2,7 +2,7 @@
 "name": "nightTab",
 "short_name": "nightTab",
 "description": "A neutral new tab page accented with a chosen colour. Customise the layout, style, background and bookmarks in nightTab.",
-"version": "3.20.0",
+"version": "3.20.1",
 "manifest_version": 2,
 "chrome_url_overrides":{
 "newtab": "index.html"