See #211, release log:

• d791094 by @yegor256: #211 rubocop
• 486940c by @yegor256: #211 cfg
• 010cb64 by @yegor256: #211 docker cfg
• 485a827 by @yegor256: #211 typos
• 369758b by @yegor256: Merge pull request #212 from m...
• 763c1c9 by @mbao01: [#211] update test file name
• 48fbde7 by @mbao01: [#211] support more puzzle tes...
• 82813fd by @yegor256: deps up
• 8ef2ee3 by @yegor256: format
• b0f9c3a by @yegor256: doc
• e1ad5c9 by @yegor256: badge
• 1c810f1 by @yegor256: codacy
• 09555b7 by @yegor256: #211 one more
• 9a9649c by @yegor256: #211 one more
• de26b5b by @yegor256: #211 extra tests

Released by Rultor 2.0-SNAPSHOT, see build log