remove Compat from Project.toml

[bjarthur]

completes #1352 and supercedes #1354

[codecov-io]

Codecov Report

Merging #1355 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1355   +/-   ##
=======================================
  Coverage   90.59%   90.59%           
=======================================
  Files          37       37           
  Lines        3945     3945           
=======================================
  Hits         3574     3574           
  Misses        371      371

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