Bump to v2.1

Author: Write

TangerineUI.user.js

@@ -38,7 +38,7 @@
     /* and look at the tag name in the left sidebar of the release
      * */
     const tag_below_4_3_0 = "v1.9.5"
-    const tag_above_or_equals_4_3_0 = "v2.0"
+    const tag_above_or_equals_4_3_0 = "v2.1"
 
     /* ----------------
      *   HELPERS