Fix git alias to update submodules recursively

.gitconfig

@@ -18,7 +18,7 @@
     ls = ls-files
     ign = ls-files -o -i --exclude-standard
     unstage = reset HEAD
-    subdate = git submodule update --init --recursive
+    subdate = submodule update --init --recursive
 
 [color]
     ui = auto