🚧 test: Trying to drop TravisCI

[motss]

Description

CircleCI has been so popular with its containerized approach which is faster than that of TravisCI's VM approach by a few magnitude.

Notable changes

• To drop TraviCI in favor of CircleCI (totally!)

[codecov]

Codecov Report

Merging #6 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master     #6   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          25     25           
=====================================
  Hits           25     25

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[coveralls]

Pull Request Test Coverage Report for Build 161

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 69:	0.0%
Covered Lines:	25
Relevant Lines:	25

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 164

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

---

Totals
Change from base Build 69:	0.0%
Covered Lines:	25
Relevant Lines:	25

---

💛 - Coveralls