Add support for boolean variable type in Multiply primitive

[thehomebrewnerd]

Pull Request Description

Update binary_transform.py to include support for boolean variable types in the Multiply primitive. Also, added a test in test_transform_features.py to confirm this works properly when multiplying numeric by numeric, bool by numeric, and numeric by bool.

This PR closes issue #752

[codecov]

Codecov Report

Merging #756 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #756      +/-   ##
==========================================
+ Coverage   97.68%   97.69%   +<.01%     
==========================================
  Files         118      118              
  Lines       10550    10576      +26     
==========================================
+ Hits        10306    10332      +26     
  Misses        244      244

Impacted Files	Coverage Δ
...aturetools/primitives/standard/binary_transform.py	100% <100%> (ø)	⬆️
featuretools/feature_base/feature_base.py	97.89% <100%> (+0.01%)	⬆️
...s/tests/primitive_tests/test_transform_features.py	98.4% <100%> (+0.04%)	⬆️

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[rwedge]

Looks good!

[rwedge]

If you have the privileges you can go ahead and merge it in, otherwise I can do it.

[thehomebrewnerd]

I was able to do it. Do you want me to go ahead and close out the related issue as well?

[rwedge]

Yep!