Fix DuplicateImportsRule's support for import attributes

[keith]

No description provided.

[SwiftLintBot]

	12 Messages
📖	Linting Aerial with this PR took 1.95s vs 1.88s on master (3% slower)
📖	Linting Alamofire with this PR took 2.75s vs 2.7s on master (1% slower)
📖	Linting Firefox with this PR took 9.29s vs 9.29s on master (0% slower)
📖	Linting Kickstarter with this PR took 15.47s vs 15.3s on master (1% slower)
📖	Linting Moya with this PR took 1.35s vs 1.3s on master (3% slower)
📖	Linting Nimble with this PR took 1.37s vs 1.37s on master (0% slower)
📖	Linting Quick with this PR took 0.6s vs 0.59s on master (1% slower)
📖	Linting Realm with this PR took 4.43s vs 4.39s on master (0% slower)
📖	Linting SourceKitten with this PR took 1.03s vs 1.02s on master (0% slower)
📖	Linting Sourcery with this PR took 7.22s vs 7.11s on master (1% slower)
📖	Linting Swift with this PR took 10.98s vs 10.91s on master (0% slower)
📖	Linting WordPress with this PR took 17.48s vs 17.37s on master (0% slower)

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[codecov-io]

Codecov Report

Merging #3402 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3402   +/-   ##
=======================================
  Coverage   90.50%   90.51%           
=======================================
  Files         420      420           
  Lines       20555    20557    +2     
=======================================
+ Hits        18604    18607    +3     
+ Misses       1951     1950    -1     

Impacted Files	Coverage Δ
...amework/Rules/Idiomatic/DuplicateImportsRule.swift	98.21% <100.00%> (ø)
...Rules/Idiomatic/DuplicateImportsRuleExamples.swift	100.00% <100.00%> (ø)
...iftLintFramework/Extensions/String+SwiftLint.swift	94.54% <0.00%> (-1.82%)	⬇️
...tFramework/Rules/Lint/ValidIBInspectableRule.swift	100.00% <0.00%> (+1.35%)	⬆️
...ftLintFramework/Rules/Lint/PrivateOutletRule.swift	100.00% <0.00%> (+3.84%)	⬆️

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[jpsim]

Thanks!