release for v2.4.1

[ddymko]

Description

Dep updates + travis bump to 1.15, 1.16, and tip for tests

Related Issues

#138 #137

Checklist:

• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you linted your code locally prior to submission?
• Have you successfully ran tests with your changes locally?

[codecov]

Codecov Report

Merging #139 (e764a36) into master (07236ce) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #139   +/-   ##
=======================================
  Coverage   55.00%   55.00%           
=======================================
  Files          23       23           
  Lines        1169     1169           
=======================================
  Hits          643      643           
  Misses        264      264           
  Partials      262      262           

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