Feature request: uninstall as an alias to remove

[technicalpickles]

I do this almost every time I am trying to remove a package:

❯ fisher uninstall whatever
fisher: Unknown command: "uninstall"

It is fisher remove. If the command to add a package is fisher install, I think it makes sense that to remove is fisher uninstall for symmetry. I could see fisher add as an alias to fisher install, but that isn't one I accidentally do personally.

In case it is helpful for prior art and comparisons to other package managers:

• gem uses install and uninstall
• pip uses install and uninstall
• bundler uses and and remove (also install that is installing the bundle and doesn't have an opposite)
• npm uses install and uninstall, with several aliases (add and remove)
• yarn uses add and remove (same as bundler)

[2-4601]

Related #593.