Improve zsh script to revert to default node version when exiting a .nvmrc directory.

README.markdown

@@ -199,6 +199,9 @@ autoload -U add-zsh-hook
 load-nvmrc() {
   if [[ -f .nvmrc && -r .nvmrc ]]; then
     nvm use
+  elif [[ $(nvm version) != $(nvm version default)  ]]; then
+    echo "Reverting to nvm default version"
+    nvm use default
   fi
 }
 add-zsh-hook chpwd load-nvmrc