Update tag for release 2.9.10

Author: martinsumner

rebar.config

@@ -36,7 +36,7 @@
         {riak_pipe, ".*", {git, "git://github.com/basho/riak_pipe.git", {tag, "riak_kv-2.9.1"}}},
         {riak_dt, ".*", {git, "git://github.com/basho/riak_dt.git", {tag, "riak_kv-2.9.1"}}},
         {eunit_formatters, ".*", {git, "git://github.com/seancribbs/eunit_formatters", {tag, "0.1.2"}}},
-        {kv_index_tictactree, ".*", {git, "https://github.com/martinsumner/kv_index_tictactree.git", {tag, "0.9.20"}}},
+        {kv_index_tictactree, ".*", {git, "https://github.com/martinsumner/kv_index_tictactree.git", {tag, "0.9.21"}}},
         {riak_core, ".*", {git, "https://github.com/basho/riak_core.git", {tag, "riak_kv-2.9.2"}}},
         {riak_api, ".*", {git, "git://github.com/basho/riak_api.git", {tag, "riak_kv-2.9.2"}}},
         {hyper, ".*", {git, "git://github.com/basho/hyper", {tag, "1.0.1"}}},