kvs git address

apps/db/rebar.config

@@ -1,3 +1,3 @@
 {deps, [
-    {kvs,     ".*", {git, "https://github.com/synrc/kvs_core", "HEAD"}}
+    {kvs,     ".*", {git, "git://github.com/synrc/kvs_core", "HEAD"}}
 ]}.