Update SourceKitten

[norio-nomura]

This will fix #2273

[SwiftLintBot]

	1 Warning
⚠️	Please include a CHANGELOG entry to credit yourself! You can find it at CHANGELOG.md.

	12 Messages
📖	Linting Aerial with this PR took 0.37s vs 0.39s on master (5% faster)
📖	Linting Alamofire with this PR took 3.33s vs 3.49s on master (4% faster)
📖	Linting Firefox with this PR took 13.13s vs 12.66s on master (3% slower)
📖	Linting Kickstarter with this PR took 20.72s vs 17.09s on master (21% slower)
📖	Linting Moya with this PR took 2.31s vs 1.89s on master (22% slower)
📖	Linting Nimble with this PR took 1.84s vs 1.56s on master (17% slower)
📖	Linting Quick with this PR took 0.57s vs 0.5s on master (13% slower)
📖	Linting Realm with this PR took 3.58s vs 3.17s on master (12% slower)
📖	Linting SourceKitten with this PR took 1.16s vs 0.98s on master (18% slower)
📖	Linting Sourcery with this PR took 5.08s vs 4.48s on master (13% slower)
📖	Linting Swift with this PR took 31.7s vs 27.81s on master (13% slower)
📖	Linting WordPress with this PR took 18.84s vs 15.31s on master (23% slower)

Here's an example of your CHANGELOG entry:

* Update SourceKitten.  
  [norio-nomura](https://github.com/norio-nomura)
  [#issue_number](https://github.com/realm/SwiftLint/issues/issue_number)

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Generated by 🚫 Danger

[codecov-io]

Codecov Report

Merging #2279 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2279      +/-   ##
==========================================
+ Coverage   92.11%   92.12%   +<.01%     
==========================================
  Files         286      286              
  Lines       14533    14533              
==========================================
+ Hits        13387    13388       +1     
+ Misses       1146     1145       -1

Impacted Files	Coverage Δ
...iftLintFramework/Extensions/String+SwiftLint.swift	91.07% <0%> (+1.78%)	⬆️

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[marcelofabri]

I thought I had done this but I actually never create a PR 😅

Thanks for doing this!

[norio-nomura]

🙂

[clayreimann]

Looks like this isn't released to cocoapods, any reason in particular?