added submodule update to install

Author: zjrosen1

install.sh

@@ -8,6 +8,7 @@ while true; do
 case $yn in
 [Yy]* ) 
 ln -sf ~/.vim/vimrc ~/.vimrc ;
+git submodule update --init ;
 vim +PluginInstall +qall
 break;;
 [Nn]* ) echo "Bye";