Update rebar.config

Switch to develop-2.9 poolboy

Author: martinsumner

rebar.config

@@ -11,7 +11,7 @@
 
 {deps, [
   {lager, ".*", {git, "git://github.com/basho/lager.git", {tag, "3.2.4"}}},
-  {poolboy, ".*", {git, "git://github.com/basho/poolboy.git", {tag, "0.8.2"}}},
+  {poolboy, ".*", {git, "git://github.com/basho/poolboy.git", {branch, "develop-2.9"}}},
   {basho_stats, ".*", {git, "git://github.com/basho/basho_stats.git", {tag, "1.0.3.5"}}},
   {riak_sysmon, ".*", {git, "https://github.com/basho/riak_sysmon.git", {tag, "2.1.5"}}},
   {eleveldb, ".*", {git, "git://github.com/martinsumner/eleveldb.git", {branch, "mas-2.0.34-ee"}}},