git-and-tools/hub: 2.2.0-rc1 -> 2.2.1

pkgs/applications/version-management/git-and-tools/hub/default.nix

···
 
 stdenv.mkDerivation rec {
   name = "hub-${version}";
-  version = "2.2.0-rc1";
+  version = "2.2.1";
 
   src = fetchgit {
     url = https://github.com/github/hub.git;
     rev = "refs/tags/v${version}";
-    sha256 = "1f6r8vlwnmqmr85drfv24vhqx1aacz6s83c2i804v9997n0wrwfm";
+    sha256 = "1rklqm5b0n5rcbdsr6kvk24cw7dc505ylb1608fva7qman49vlls";
   };