Update Requirements

[rogebrd]

• Add requirements.txt
• Remove Travis
• Add mypy to CI
• Update tox to reflect new commands

Checklist

General Contributing

• Have you read the Code of Conduct and signed the CLA?

Is This a Code Change?

• Non-code related change (markdown/git settings etc)
• Code Change
• Example/Test Code Change

Validation

• Have you ran tox?
• Do the tests pass?

[codecov]

Codecov Report

Merging #189 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #189   +/-   ##
=======================================
  Coverage   51.03%   51.03%           
=======================================
  Files          37       37           
  Lines        8334     8334           
  Branches     1776     1776           
=======================================
  Hits         4253     4253           
  Misses       3762     3762           
  Partials      319      319           

Flag	Coverage Δ
#unit	51.03% <ø> (ø)

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