Update rector/rector requirement from 0.12.18 to 0.15.21

[dependabot[bot]]

Updates the requirements on rector/rector to permit the latest version.

Commits

• 1cee8cc Rector 0.15.21
• 3a55fbc Updated Rector to commit 0433671480db4a41267eddcab741ba1739b58f1f
• 9a50d02 Updated Rector to commit d8dae934146cb5b99c6bd9eba340aa1863dce08c
• 7a5d9d8 Updated Rector to commit 6091bdd821a72aa9df52363d944b003ec2fbaf1d
• 16c8379 Updated Rector to commit ee55387e6a9171be6dfa446323eac57d247f7c45
• b1ccc29 Updated Rector to commit 00b6703cdc1c7dde6a568b1121fb7ba5c2dc06a7
• c3c4fb3 Rector 0.15.20
• 2f750e7 Updated Rector to commit bf6fdc70b4b903a27367926d189400d279dcb411
• 6fea23a Updated Rector to commit d9dc05621793de2fa23815b73e8db94c8f56b30d
• 57f48de Updated Rector to commit ed16cab5a2fa6982539e06ad70ac9c119c7dc346
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.89%. Comparing base (fdd483f) to head (af4d384).

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #169   +/-   ##
=========================================
  Coverage     99.89%   99.89%           
  Complexity     1072     1072           
=========================================
  Files           119      119           
  Lines          2746     2837   +91     
=========================================
+ Hits           2743     2834   +91     
  Misses            3        3           

see 38 files with indirect coverage changes