[WIP]-corrected the #275 pull request

[shyamcody]

Made the following changes:
(1) type_ changed to output.
(2) changed the documentation for return.
(3) added test function to check the shape as well as valueError.

[codecov]

Codecov Report

Merging #277 into master will decrease coverage by 0.15%.
The diff coverage is 90.00%.

@@            Coverage Diff             @@
##           master     #277      +/-   ##
==========================================
- Coverage   95.21%   95.06%   -0.16%     
==========================================
  Files          22       22              
  Lines        3178     3202      +24     
==========================================
+ Hits         3026     3044      +18     
- Misses        152      158       +6     

Impacted Files	Coverage Δ
pygam/distributions.py	88.40% <ø> (ø)
pygam/tests/test_GAM_methods.py	98.97% <88.88%> (-1.03%)	⬇️
pygam/pygam.py	94.83% <91.66%> (+0.03%)	⬆️
pygam/tests/test_utils.py	95.10% <0.00%> (-1.40%)	⬇️
pygam/utils.py	87.42% <0.00%> (-0.31%)	⬇️

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[shyamcody]

@dswah just check this pull once. All of the tests have passed successfully; so probably good to go.

[shyamcody]

Changed the gamma parameter from being default in 1.4 to a user side parameter. #76 should be solved with this. Successfully added gamma and test.

[shyamcody]

@dswah can you merge this change for now? I tried my hand with further development; but seems I am not able to do anything for now. So would like to get this merged.