Decapitalize short option for 'version'

src/rebar3.erl

@@ -245,7 +245,7 @@ global_option_spec_list() ->
     [
     %% {Name, ShortOpt, LongOpt, ArgSpec, HelpMsg}
     {help,     $h, "help",     undefined, "Print this help."},
-    {version,  $V, "version",  undefined, "Show version information."},
+    {version,  $v, "version",  undefined, "Show version information."},
     %{config,   $C, "config",   string,    "Rebar config file to use."},
     {task,     undefined, undefined, string, "Task to run."}
     ].