Single URL for installing latest version of NVM

[therebelrobot]

In your docs, you have the following url for installing nvm:

 https://raw.githubusercontent.com/creationix/nvm/v0.23.0/install.sh

This url, if put in a build script or a tutorial will be come deprecated with future releases, as has the previous ones I've used. Would it be possible to set up a single url to link to the most recent stable release like this:

 https://raw.githubusercontent.com/creationix/nvm/latest-stable/install.sh

Just a thought, I love your tool, and use it as the basic install for any newbie I teach about node, I just want to make sure they have the latest, even if you just released it a few hours ago.

[ljharb]

That's up to github, not up to me. Long term, #400 will solve this, and the proper way to install nvm will be to install "any version that has updating", and then nvm update - at that point it won't matter what the URL is.

Relates to #599, #561, #522.