supervisor template: add missing comma

priv/templates/sup.erl

@@ -27,7 +27,7 @@ start_link() ->
 %%                  type => worker(),       % optional
 %%                  modules => modules()}   % optional
 init([]) ->
-    SupFlags = #{strategy => one_for_all
+    SupFlags = #{strategy => one_for_all,
                  intensity => 0,
                  period => 1},
     ChildSpecs = [],