Use latest version flag

[DasdWaller]

In my work we use nvm4w and have 2 project with different node versions and need to switch often. It will very helpful for us to have a flag that don't need to add the full node version when need to use the nvm use *. This feature is great when you have to switch versions and want to avoid the full version name.

Example:

nvm list

15.6.0 (Currently using 64-bit executable)
15.2.1
14.15.4
14.15.1
14.15.0

nvm use 15 -l or nvm use 15 --last.
nvm use 14 -l or nvm use 14 --last.

[coreybutler]

Closing as a duplicate of #156 and #539.

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