Use Github Actions for CI

[Maronato]

Description

Adds github actions for testing and removes travis configs

Related Issue

Screenshots or GIFs (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #279 (37dcbc2) into next (2204ab5) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              next      #279   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        16    -2     
  Lines          419       478   +59     
  Branches        82        95   +13     
=========================================
+ Hits           419       478   +59     

Impacted Files	Coverage Δ
src/components/VtToast.vue	100.00% <ø> (ø)
src/components/VtToastContainer.vue	100.00% <100.00%> (ø)
src/components/VtTransition.vue	100.00% <100.00%> (ø)
src/index.ts	100.00% <100.00%> (ø)
src/ts/propValidators.ts	100.00% <100.00%> (ø)
src/ts/utils.ts	100.00% <100.00%> (ø)
src/ts/eventBus.ts	100.00% <0.00%> (ø)
src/ts/interface.ts	100.00% <0.00%> (ø)
... and 7 more

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