Fix Grid ssr with maxElementSize util

[TrySound]

Ref #936

[bvaughn]

Thanks buddy!

Will you handle the NPM release as well?

[TrySound]

Sure.

[codecov-io]

Codecov Report

Merging #970 into master will increase coverage by 0.19%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #970      +/-   ##
==========================================
+ Coverage      90%   90.19%   +0.19%     
==========================================
  Files          59       59              
  Lines        1670     1672       +2     
==========================================
+ Hits         1503     1508       +5     
+ Misses        167      164       -3

Impacted Files	Coverage Δ
source/Grid/utils/maxElementSize.js	88.88% <75%> (+3.17%)	⬆️
source/WindowScroller/utils/dimensions.js	100% <0%> (+5%)	⬆️
source/utils/animationFrame.js	72.72% <0%> (+18.18%)	⬆️

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