chore(ci): Replace Travis with Github Actions

[StephenSorriaux]

Fixes #651

Why is this needed?

So that CI is running again.

Proposed Changes

• Drop Travis
• Use Github Actions
• Profit

Does this PR introduce any breaking change?

N/A

[codecov-commenter]

Codecov Report

Merging #652 (8eb462f) into master (6337fd6) will increase coverage by 0.09%. The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           master     #652      +/-   ##
==========================================
+ Coverage   94.16%   94.26%   +0.09%     
==========================================
  Files          56       56              
  Lines        8246     8246              
==========================================
+ Hits         7765     7773       +8     
+ Misses        481      473       -8     

Impacted Files	Coverage Δ
kazoo/tests/test_build.py	87.50% <50.00%> (ø)
kazoo/tests/util.py	63.88% <83.33%> (ø)
kazoo/tests/test_client.py	98.90% <100.00%> (+0.09%)	:arrow_up:
kazoo/tests/test_connection.py	98.09% <100.00%> (ø)
kazoo/tests/test_queue.py	97.12% <100.00%> (ø)
kazoo/tests/test_sasl.py	87.06% <100.00%> (ø)
kazoo/recipe/lock.py	98.29% <0.00%> (ø)
kazoo/client.py	98.41% <0.00%> (+0.15%)	:arrow_up:
kazoo/tests/test_lock.py	98.89% <0.00%> (+0.18%)	:arrow_up:
... and 3 more

---

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[StephenSorriaux]

@bbangert I don't think I have rights to remove the continuous-integration/travis-ci checks from being required (or even there at all?), is this something you can update?

[StephenSorriaux]

Gentle ping @bbangert

[StephenSorriaux]

Another ping @bbangert :pleading_face:, if you have some times to look at the secret so that I can merge this. Thank you