upgrade node using nvm code example

Example 1: update npm with nvm

nvm install-latest-npm

Example 2: nvm update

#!/bin/sh

set -e

cd ~/.nvm

git fetch --tags
TAG=$(git describe --tags `git rev-list --tags --max-count=1`)
echo "Checking out tag $TAG..."
git checkout "$TAG"

source ~/.nvm/nvm.sh