Fixes #325 indexing via boolean

[JBorrow]

Fixes Issue #325

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 37.60%. Comparing base (13fcf79) to head (d8b2049).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pixell/utils.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #326   +/-   ##
=======================================
  Coverage   37.60%   37.60%           
=======================================
  Files          37       37           
  Lines       11540    11540           
=======================================
  Hits         4340     4340           
  Misses       7200     7200           

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[msyriac]

Could merge if @mhasself is ok with this?

[mhasself]

Yup, this'll do it.