Update rebar.config

rebar.config

@@ -1,3 +1,3 @@
 {deps_dir,"deps"}.
 {erl_opts,[nowarn_export_all]}.
-{deps,[{sh,".*",{git,"git://github.com/synrc/sh",[]}}]}.
+{deps,[{sh,".*",{git,"git://github.com/synrc/sh",{tag,"2.11"}}}]}.