Update ConsGenIncProcessModel.py

[alanlujan91]

Implements calc_expectation on ConsGenIncProcessSolver.

• [NA] Tests for new functionality/models or Tests to reproduce the bug-fix in code.
• [NA] Updated documentation of features that add new functionality.
• Update CHANGELOG.md with major/minor changes.

[codecov-commenter]

Codecov Report

Merging #1072 (4c62b52) into master (d59269d) will decrease coverage by 0.02%.
The diff coverage is 86.00%.

@@            Coverage Diff             @@
##           master    #1072      +/-   ##
==========================================
- Coverage   72.53%   72.51%   -0.03%     
==========================================
  Files          68       68              
  Lines       10298    10304       +6     
==========================================
+ Hits         7470     7472       +2     
- Misses       2828     2832       +4     

Impacted Files	Coverage Δ
HARK/ConsumptionSaving/ConsGenIncProcessModel.py	82.31% <84.78%> (-0.87%)	⬇️
...umptionSaving/tests/test_ConsGenIncProcessModel.py	100.00% <100.00%> (ø)

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[sbenthall]

This looks good to me!
I think it just needs a changelog entry and then it's ready to merge.

[alanlujan91]

Done!