#trivial Fix `swiftlint.directory` code sample

[taisukeh]

I encountered a problem with the code.

Danger::DSLError: 
[!] Invalid `dangerfile.rb` file: wrong number of arguments (given 1, expected 0)
#  from dangerfile.rb:1
#  -------------------------------------------
>  swiftlint.directory "."
#  swiftlint.lint_files inline_mode: true

[ashfurrow-peril[bot]]

It looks like code was changed without adding anything to the Changelog.

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