Update rebar.config

Author: martinsumner

rebar.config

@@ -10,7 +10,7 @@
 {deps, [
         {riak_pb, {git, "https://github.com/basho/riak_pb.git", {tag, "3.0.8"}}},
         {webmachine, {git, "https://github.com/webmachine/webmachine.git", {tag, "1.11.1"}}},
-        {riak_core, {git, "https://github.com/basho/riak_core.git", {branch, "develop-3.0"}}},
+        {riak_core, {git, "https://github.com/basho/riak_core.git", {tag, "riak_kv-3.0.9"}}},
         {mochiweb, {git, "https://github.com/basho/mochiweb.git", {tag, "2.12.1+riak.3.0.4"}}}
         ]}.