Remove use of pip-tools

Fixes #37 (closed)

Created by: codecov[bot]

Codecov Report

Merging #38 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #38   +/-   ##
=======================================
  Coverage   99.56%   99.56%           
=======================================
  Files          23       23           
  Lines         930      930           
=======================================
  Hits          926      926           
  Misses          4        4

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