Removed isKind(of:)

[jjatie]

in favour of the Swift is

[jjatie]

The uses of isKind(of:) in the equality methods are taken care of in #3002

[codecov-io]

Codecov Report

Merging #3044 into master will increase coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #3044      +/-   ##
==========================================
+ Coverage   19.77%   19.78%   +<.01%     
==========================================
  Files         113      113              
  Lines       13663    13660       -3     
==========================================
  Hits         2702     2702              
+ Misses      10961    10958       -3

Impacted Files	Coverage Δ
Source/Charts/Charts/BarLineChartViewBase.swift	23.17% <0%> (+0.06%)	⬆️
Source/Charts/Charts/PieRadarChartViewBase.swift	0% <0%> (ø)	⬆️

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[jjatie]

@liuxuan30 This is a quick and easy one.

[liuxuan30]

sorry, had a busy week. I will try finish some

[liuxuan30]

info: https://stackoverflow.com/questions/24877661/is-there-a-difference-between-is-and-iskindofclass
https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/TypeCasting.html#//apple_ref/doc/uid/TP40014097-CH22