make the hook for windows work

rebar.config

@@ -14,9 +14,11 @@
 
 {post_hooks, [{"(linux|darwin|solaris|freebsd|netbsd|openbsd)",
                escriptize,
-               "cp $REBAR_BUILD_DIR/bin/rebar3 ./rebar3"},
+               "cp \"$REBAR_BUILD_DIR/bin/rebar3\" ./rebar3"},
               {"win32",
-               "robocopy $REBAR_BUILD_DIR/bin/ ./ rebar3*"}
+               escriptize,
+               "robocopy \"%REBAR_BUILD_DIR%/bin/\" ./ rebar3* "
+               "/njs /njh /nfl /ndl & exit /b 0"} % silence things
              ]}.
 
 {escript_name, rebar3}.