use GitHub Actions:

[aviatesk]

• test on all the platforms, machine architecture, with the power of Azure in the back
• fix test on 32bit system
• skip test of realpath issue in macOS with v1.0

[aviatesk]

So Azure's concurrent task ability allows us to finish those 15 tests in ~8mins, while with travis we have to wait ~30 mins until all the tests get finished iirc.
Right now I couldn't setup codecov report correctly though. The results are uploaded to codecov server, but uploading the coverage results into PR comment fails with the following error:

RROR: HTTP.ExceptionRequest.StatusError(400, "POST", "/upload/v2?&service=custom&commit=b13caf048447000a4411eceea923c158703ff673&slug=JunoLab/Atom.jl&token=", HTTP.Messages.Response:
"""
HTTP/1.1 400 Bad Request
Server: nginx/1.13.12
Date: Sun, 12 Apr 2020 05:44:43 GMT
Content-Type: text/html; charset=UTF-8
Content-Length: 32867
Connection: keep-alive
X-Xss-Protection: 1; mode=block
Content-Security-Policy: default-src 

---

EDIT: that seems to have been fixed by using julia-actions/julia-processcoverage@v1

[codecov]

Codecov Report

Merging #319 into master will increase coverage by 0.19%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #319      +/-   ##
==========================================
+ Coverage   54.76%   54.95%   +0.19%     
==========================================
  Files          42       42              
  Lines        2615     2615              
==========================================
+ Hits         1432     1437       +5     
+ Misses       1183     1178       -5     

Flag	Coverage Δ
#unittests	54.95% <ø> (?)

Impacted Files	Coverage Δ
src/goto.jl	84.56% <0.00%> (-0.68%)	⬇️
src/utils.jl	87.77% <0.00%> (+1.11%)	⬆️
src/completions.jl	76.79% <0.00%> (+2.76%)	⬆️

---

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