ci: migrate to GH Actions

[kushagra189]

• bump dependencies
• CI uses GitHub Actions instead of Travis

Fixes #115

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] I have not reduced the existing code coverage

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (dev@71433c2). Click here to learn what that means. The diff coverage is n/a.

@@           Coverage Diff           @@
##             dev      #116   +/-   ##
=======================================
  Coverage       ?   100.00%           
=======================================
  Files          ?        14           
  Lines          ?       670           
  Branches       ?         0           
=======================================
  Hits           ?       670           
  Misses         ?         0           
  Partials       ?         0           

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