Travis build is broken

[idbrii]

I'm not sure what travis is doing. I guess validating the casks against brew?.

$ rvm use system --install --binary --fuzzy
curl: (22) The requested URL returned error: 404 Not Found
Now using system ruby.
...
$ gem install bundler
Fetching: bundler-2.1.4.gem (100%)
ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.3.0 directory.
The command "gem install bundler" failed and exited with 1 during .
Your build has been stopped.

I don't see any 'Running before_script.sh...' output. Seems like that's where we setup the gem home so it doesn't install into the system dir.

Looks like it broke here -- somewhere near 64c17f6.
Before that it was dying on gpg.

I thought this was related to why newer Unity versions (2019.3.10f1) weren't showing up, but it seems that the travis build has been broken for a looong time and something is adding new unity versions.