only fetch branch needed, remove rebar_vsn_plugins from erlware_commons

rebar.config

@@ -46,4 +46,4 @@
            ]}.
 
 %% Overrides
-{overrides, [{override, erlware_commons, [{plugins, []}]}]}.
+{overrides, [{override, erlware_commons, [{deps, []}, {plugins, []}]}]}.

rebar.lock

@@ -1,8 +1,4 @@
-[{<<"rebar_vsn_plugin">>,
-  {git,"https://github.com/erlware/rebar_vsn_plugin.git",
-       {ref,"fd40c960c7912193631d948fe962e1162a8d1334"}},
-  2},
- {<<"relx">>,
+[{<<"relx">>,
   {git,"https://github.com/tsloughter/relx.git",
        {ref,"6e0d048d3840464539deddd9d5b53e9f421edee4"}},
   0},

src/rebar_git_resource.erl

@@ -32,7 +32,7 @@ needs_update(Dir, {git, Url, {tag, Tag}}) ->
     not ((Current1 =:= Tag) andalso compare_url(Dir, Url));
 needs_update(Dir, {git, Url, {branch, Branch}}) ->
     %% Fetch remote so we can check if the branch has changed
-    {ok, _} = rebar_utils:sh(?FMT("git fetch", []),
+    {ok, _} = rebar_utils:sh(?FMT("git fetch origin ~s", [Branch]),
                              [{cd, Dir}]),
     %% Check for new commits to origin/Branch
     {ok, Current} = rebar_utils:sh(?FMT("git log HEAD..origin/~s --oneline", [Branch]),