Update codecov badge.

[ruebot]

Follow-up for #89

[ruebot]

@whikloj @seth-shaw-asu

[codecov]

Codecov Report

Base: 78.07% // Head: 78.07% // No change to project coverage 👍

Coverage data is based on head (e38c69e) compared to base (18374b6).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##                2.x      #90   +/-   ##
=========================================
  Coverage     78.07%   78.07%           
  Complexity      149      149           
=========================================
  Files            30       30           
  Lines           570      570           
  Branches         27       27           
=========================================
  Hits            445      445           
  Misses          102      102           
  Partials         23       23           

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[whikloj]

Doh 🤦