Switch from Travis-CI to Github Workflows

[OldhamMade]

Changes

• remove Travis-CI config file
• add dependency for automated code checks
• add Github Workflow to run automated code checks against recent versions of Crystal (>= 0.36.1)
• add Github Workflow to run tests against recent versions of Crystal (>= 0.36.1)
• change minimum Crystal version requirement to match that of dependencies
• change patch version to reflect min Crystal version change

[stephendolan]

Is this necessary since the /lib/ folder is in the .gitignore anyways?

I've never had issues with Ameba raising errors for installed shard dependencies.

[OldhamMade]

I had to specifically add this so that ameba didn't report errors for taylorfinnell/awscr-signer.

[taylorfinnell]

Thank you! If you're up for it let's add the matrix of versions, if not let me know and I will merge as is

[OldhamMade]

Thank you! If you're up for it let's add the matrix of versions, if not let me know and I will merge as is

I'll add the matrix now; I wanted to raise the PR with just enough to be able to switch over from Travis and to start a discussion.

[OldhamMade]

Matrix added. Also had to change the min crystal version due to min version in the deps; bumped the version to reflect this change.

Checks are passing, but tests themselves are still failing with an Unhandled exception: File not open for writing error for an Awscr::S3::FileUploader:when the file is larger than 5MB test.

All tests are passing locally for me on macOS 11.2 with Crystal 1.0.0

[taylorfinnell]

How do I see the Action runs? Is that same test failing on travis? If so, I can just merge this and sort that out later

[stephendolan]

@taylorfinnell, unfortunately as far as I'm aware, this will need to be merged before you can actually see the new workflows running.