Support python 3.7.0

[cgarciae]

Changes

Recent change briefly added a restraint on poetry for python>=3.7.1 so mkdocs-jupyter could be installed. Since this is a dev dependecy its easier just to add the restraint on mkdocs-jupyter itself.

[codecov-commenter]

Codecov Report

Merging #65 (5722ab8) into master (4e1256d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #65   +/-   ##
=======================================
  Coverage   65.04%   65.04%           
=======================================
  Files          55       55           
  Lines        2815     2815           
=======================================
  Hits         1831     1831           
  Misses        984      984           

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