Quick addition/revision to function rules

[alicekwak]

• Added a few function rules to cover more patterns found from CHIME / SIR models
• Revised a function arg filter to capture wrongly excluded cases (i.e. inputs / outputs with gerunds)

[codecov[bot]]

Codecov Report

Merging #244 (2009566) into master (0acc322) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 2009566 differs from pull request most recent head 582974c. Consider uploading reports for the commit 582974c to get more accurate results

@@           Coverage Diff           @@
##           master     #244   +/-   ##
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  Coverage   66.20%   66.20%           
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  Files          90       90           
  Lines       16920    16920           
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  Hits        11202    11202           
  Misses       5718     5718           

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