Test logical xor stairs 1

[amagee]

Seems to do what was asked for in the ticket, let me know if you want anything more / different.

• closes ENH: Missing test for Stairs.logical_xor for Stairs over float domain #105
• tests added / passed
• ensure all linting tests pass
• changelog entry

[codecov-commenter]

Codecov Report

Merging #106 (b87c6d2) into master (e0a45c0) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #106      +/-   ##
==========================================
+ Coverage   94.36%   94.42%   +0.06%     
==========================================
  Files          32       32              
  Lines        1561     1561              
==========================================
+ Hits         1473     1474       +1     
+ Misses         88       87       -1     

Impacted Files	Coverage Δ
staircase/core/ops/logical.py	92.10% <0.00%> (+1.31%)	⬆️

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[venaturum]

Great, thanks @amagee

Can we have an additional, but very similar test, which checks:

(s3_fix ^ ~s3_fix).identical(1)

The ~ operator is a "not" operator.