Add configuration to discouraged_object_literal

[marcelofabri]

Fixes #2439

[SwiftLintBot]

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📖	Linting Aerial with this PR took 2.11s vs 2.22s on master (4% faster)
📖	Linting Alamofire with this PR took 4.65s vs 4.77s on master (2% faster)
📖	Linting Firefox with this PR took 17.16s vs 15.84s on master (8% slower)
📖	Linting Kickstarter with this PR took 26.96s vs 23.01s on master (17% slower)
📖	Linting Moya with this PR took 2.58s vs 2.18s on master (18% slower)
📖	Linting Nimble with this PR took 2.52s vs 2.01s on master (25% slower)
📖	Linting Quick with this PR took 0.71s vs 0.64s on master (10% slower)
📖	Linting Realm with this PR took 4.57s vs 3.99s on master (14% slower)
📖	Linting SourceKitten with this PR took 1.46s vs 1.28s on master (14% slower)
📖	Linting Sourcery with this PR took 5.87s vs 5.3s on master (10% slower)
📖	Linting Swift with this PR took 37.16s vs 32.74s on master (13% slower)
📖	Linting WordPress with this PR took 27.53s vs 23.4s on master (17% slower)

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[jpsim]

Thanks!