Minor bug has been fixed on install script

scripts/install.sh

@@ -65,12 +65,14 @@ main() {
     exit 1
   }
 
-  pushd $ZSH
+  pwd=`pwd`
+  cd $ZSH
+
   $(env git submodule init && git submodule update) || {
     printf "Error: git submodule of My.Zsh repo failed\n"
     exit 1
   }
-  popd
+  cd $pwd
 
   printf "${BLUE}Looking for an existing zsh config...${NORMAL}\n"
   if [ -f ~/.zshrc ] || [ -h ~/.zshrc ]; then