update swiftlint/Commands to follow Swift 3 API Design Guidelines

[jpsim]

Depends on #1143. 6 out of 7 Swift 3 API Guidelines PRs. /cc @marcelofabri

[SwiftLintBot]

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

	5 Messages
📖	Linting Alamofire with this PR took 9.04s vs 8.48s on master (6% slower)
📖	Linting Aerial with this PR took 0.92s vs 0.88s on master (4% slower)
📖	Linting SourceKitten with this PR took 4.53s vs 4.74s on master (4% faster)
📖	Linting Moya with this PR took 0.95s vs 0.93s on master (2% slower)
📖	Linting realm-cocoa with this PR took 9.64s vs 9.29s on master (3% slower)

Here's an example of your CHANGELOG entry:

* update swiftlint/Commands to follow Swift 3 API Design Guidelines.  
  [jpsim](https://github.com/jpsim)
  [#issue_number](https://github.com/realm/SwiftLint/issues/issue_number)

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[codecov-io]

Current coverage is 82.71% (diff: 90.88%)

Merging #1144 into master will decrease coverage by 0.11%

@@             master      #1144   diff @@
==========================================
  Files           161        161          
  Lines          7971       7916    -55   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
- Hits           6603       6548    -55   
  Misses         1368       1368          
  Partials          0          0          

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