Document entry_points

[maxrothman]

As per #9, this feature exists but was previously undocumented.

[codecov-io]

Codecov Report

Merging #10 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #10   +/-   ##
=======================================
  Coverage   65.26%   65.26%           
=======================================
  Files          38       38           
  Lines        1684     1684           
=======================================
  Hits         1099     1099           
  Misses        585      585

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[sdispater]

Thanks!