Ensure functionality of spacefish on the 3.0 release of fish

[matchai]

Issue Details

With the release of fish 3.0, it can be expected that spacefish would require a few changes to remain compatible.

The following will need to be done:

• Add a fish 3.0 run to CI in addition to the existing 2.0 run
• Isolate any failures of our tests in fish 3.0
• See if we can make non-breaking fixes to both fish versions

Hopefully, this will be a quick and easy process. 😄

[matchai]

:tada: This issue has been resolved in version 1.12.4 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: