chore(deps-dev): bump rector/swiss-knife from 2.1.5 to 2.1.6

Bumps rector/swiss-knife from 2.1.5 to 2.1.6.

Commits

• 9c243c3 release PHP 7.2 downgraded
• a4a9a89 tv is source (#75)
• e4c7553 [new] Add trait spotter command, to spot traits to be easily refactored to cl...
• 9ed729e tv low high (#74)
• a2d6810 use cache + colors (#73)
• c553645 [command] multi package version compare (#71)
• bcbf31d Add option --no-progress to command finalize-classes (#72)
• 4024097 docs
• See full diff in compare view

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