prep target in makefile now updates the submodules

makefile

@@ -3,7 +3,7 @@
 default: build
 
 prep:
-	git submodule update --init --recursive
+	git submodule foreach --recursive bash -c "git checkout $$(git remote show origin | grep HEAD | sed 's/.*\: //'); git pull"
 
 build: prep
 	hugo