Deactivate Travis and run MacOs on GH actions

[felipeZ]

fix #205

[BvB93]

Don't forget to change the minimum python version it the pypi classifiers:

qmflows/setup.py

Line 63 in da4ed97

'Programming Language :: Python :: 3.7',

.

[BvB93]

The rest is looking good btw.

[BvB93]

Don't forget to change the minimum python version it the pypi classifiers:

Oh hang on, that's not the minimum version but all supported version.
Should be

...
'Programming Language :: Python :: 3.6', 
'Programming Language :: Python :: 3.7', 
'Programming Language :: Python :: 3.8', 
...

[BvB93]

Btw, should we set the python_requires=">=3.6" option in setup.py (ref)?
This is actually a proper minimum version and will prevent installation on python versions older than 3.6.

[codecov-commenter]

Codecov Report

Merging #206 into master will increase coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #206      +/-   ##
==========================================
+ Coverage   81.77%   81.94%   +0.16%     
==========================================
  Files          39       39              
  Lines        1855     1855              
  Branches      235      235              
==========================================
+ Hits         1517     1520       +3     
+ Misses        267      265       -2     
+ Partials       71       70       -1     

Impacted Files	Coverage Δ
src/qmflows/backports.py	86.66% <0.00%> (+10.00%)	⬆️

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