switch to master

rebar.config

@@ -1,4 +1,4 @@
 {deps_dir,"deps"}.
 {erl_opts, [nowarn_export_all]}.
 {deps, [%{ling, ".*", {git, "git://github.com/cloudozer/ling", {tag, "master"}}},
-        {sh, ".*",   {git, "git://github.com/synrc/sh", {tag, "2.10"}}}]}.
+        {sh, ".*",   {git, "git://github.com/synrc/sh", {tag, []}}}]}.