Notify user when nvm is being installed

zsh-nvm.plugin.zsh

@@ -19,6 +19,7 @@ _zsh_nvm_latest_release_tag() {
 }
 
 _zsh_nvm_install() {
+  echo "Installing nvm..."
   git clone https://github.com/creationix/nvm.git "$NVM_DIR"
   $(cd "$NVM_DIR" && git checkout --quiet "$(_zsh_nvm_latest_release_tag)")
 }