Upgrade dependencies

[kmjennison]

Upgrade all dependencies except Prebid.

[codecov]

Codecov Report

Merging #36 (937e74f) into master (04e21fd) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #36      +/-   ##
==========================================
- Coverage   96.74%   96.73%   -0.01%     
==========================================
  Files          31       31              
  Lines         676      674       -2     
  Branches      143      143              
==========================================
- Hits          654      652       -2     
  Misses         21       21              
  Partials        1        1              

Impacted Files	Coverage Δ
src/utils/test-fixtures.js	100.00% <ø> (ø)
src/fetchAds.js	100.00% <100.00%> (ø)
src/getBidders.js	100.00% <100.00%> (ø)
src/providers/indexExchange/indexExchangeBidder.js	98.61% <100.00%> (ø)
src/providers/prebid/prebidBidder.js	95.65% <100.00%> (ø)
src/utils/test-utils.js	81.08% <100.00%> (ø)

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