new build

[dswah]

• set up github actions
• use flake instead of pylint
• use poetry
• fix np.int errors and warnings

[codecov]

Codecov Report

Merging #332 (4b0396d) into master (b57b4cf) will decrease coverage by 0.21%.
The diff coverage is 90.76%.

@@            Coverage Diff             @@
##           master     #332      +/-   ##
==========================================
- Coverage   95.21%   95.01%   -0.21%     
==========================================
  Files          22       22              
  Lines        3178     3208      +30     
==========================================
+ Hits         3026     3048      +22     
- Misses        152      160       +8     

Impacted Files	Coverage Δ
pygam/tests/test_datasets.py	100.00% <ø> (ø)
pygam/links.py	92.45% <66.66%> (ø)
pygam/core.py	90.62% <75.00%> (ø)
pygam/distributions.py	88.96% <77.77%> (+0.55%)	⬆️
pygam/terms.py	94.41% <81.35%> (+<0.01%)	⬆️
pygam/tests/test_utils.py	95.13% <81.81%> (-1.37%)	⬇️
pygam/utils.py	87.07% <82.89%> (-0.66%)	⬇️
pygam/penalties.py	93.42% <84.21%> (+0.08%)	⬆️
pygam/pygam.py	94.55% <91.93%> (-0.24%)	⬇️
pygam/datasets/load_datasets.py	97.16% <94.11%> (ø)
... and 12 more

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