Fix "build unknown"

[nelsonic]

Just about to use this package for https://github.com/dwyl/mvp/issues/410 #finally and noticed that the (Travis-CI) build for this repo is:

Todo

• [x] Add GitHub Actions CI & @dependabot for updating deps.
• [x] Remove "build unknown" badge from Travis-CI
• [x] Update all badges to be consistent with our other projects e.g: https://github.com/dwyl/useful
• [x] Improve Docs examples ref: https://hexdocs.pm/excid/Cid.html
• [x] Publish new version of the package e.g: 1.0.0

Similar to @SimonLab's recent PR: https://github.com/dwyl/base58/pull/33

[nelsonic]

PR: #41

[nelsonic]

Libraries.io not working: https://libraries.io/repositories

The badge is failing:

So I'm temporarily commenting it out in the README.md 💬

[nelsonic]

Libraries badge removed: