Fixed #299 - Allow subscribe links on github.io and gitlab.io

Author: snoack

build/manifest.json

@@ -64,7 +64,9 @@
         "https://*.filterlists.com/*",
         "https://*.forums.lanik.us/*",
         "https://*.github.com/*",
+        "https://*.github.io/*",
         "https://*.gitlab.com/*",
+        "https://*.gitlab.io/*",
         "https://*.gurud.ee/*",
         "https://*.i-dont-care-about-cookies.eu/*",
         "https://*.spam404.com/*",