Update custom ad sizes

[kmjennison]

No description provided.

[codecov]

Codecov Report

Merging #33 (18668a7) into master (bb7e682) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
- Coverage   96.75%   96.74%   -0.01%     
==========================================
  Files          31       31              
  Lines         677      676       -1     
  Branches      143      143              
==========================================
- Hits          655      654       -1     
  Misses         21       21              
  Partials        1        1              

Impacted Files	Coverage Δ
src/getAvailableAdUnits.js	100.00% <ø> (ø)

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