bump fraction from 0.10.0 to 0.11.0

[jqnatividad]

this eliminates the dependency on num 0.2.1, allowing the use of num 0.4.0

[codecov[bot]]

Codecov Report

Merging #381 (d5490dc) into master (07be2ff) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #381   +/-   ##
=======================================
  Coverage   79.52%   79.52%           
=======================================
  Files          52       52           
  Lines        4455     4455           
=======================================
  Hits         3543     3543           
  Misses        912      912           

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