Use performBatchUpdates completion in extensions

[zenangst]

No description provided.

[codecov-io]

Codecov Report

Merging #24 into master will decrease coverage by 0.25%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
- Coverage    63.6%   63.34%   -0.26%     
==========================================
  Files           9        9              
  Lines         250      251       +1     
==========================================
  Hits          159      159              
- Misses         91       92       +1

Impacted Files	Coverage Δ
Source/iOS+tvOS/UITableView+Extensions.swift	0% <0%> (ø)	⬆️
Source/iOS+tvOS/UICollectionView+Extensions.swift	0% <0%> (ø)	⬆️

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