Update git alias to update submodules recursively

.gitconfig

@@ -18,8 +18,7 @@
     ls = ls-files
     ign = ls-files -o -i --exclude-standard
     unstage = reset HEAD
-    sinit = ! git submodule init && git submodule update && git submodule foreach 'git checkout master'
-    spull = submodule foreach 'git pull'
+    subdate = git submodule update --init --recursive
 
 [color]
     ui = auto