Restore code coverage upload

[ocean90]

Description

How has this been tested?

Screenshots If applicable, add screenshots to show the visual change.

Types of changes

Checklist:

• [ ] My code is tested.
• [ ] My code follows the WordPress code style.
• [ ] My code has proper inline documentation.

[codecov[bot]]

Codecov Report

Merging #208 (8d1fd10) into master (c90b5a0) will increase coverage by 0.04%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #208      +/-   ##
============================================
+ Coverage     81.55%   81.59%   +0.04%     
- Complexity      367      369       +2     
============================================
  Files            24       24              
  Lines           911      913       +2     
============================================
+ Hits            743      745       +2     
  Misses          168      168              

Impacted Files	Coverage Δ
inc/Plugin.php	46.49% <ø> (ø)
inc/Export.php	98.68% <100.00%> (+0.03%)	:arrow_up:

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