Add rector [batch]

[xepozz]

Added rector/rector to CI and composer.json. Mass creation refers to yiisoft/yii-dev-tool#232

[codecov]

Codecov Report

Base: 99.90% // Head: 100.00% // Increases project coverage by +0.09% 🎉

Coverage data is based on head (ed9403a) compared to base (562038e).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@              Coverage Diff              @@
##             master      #133      +/-   ##
=============================================
+ Coverage     99.90%   100.00%   +0.09%     
+ Complexity      769       766       -3     
=============================================
  Files            83        83              
  Lines          2010      1988      -22     
=============================================
- Hits           2008      1988      -20     
+ Misses            2         0       -2     

Impacted Files	Coverage Δ
src/Tag/Input.php	100.00% <ø> (ø)
src/Tag/Script.php	100.00% <ø> (ø)
src/Tag/Style.php	100.00% <ø> (ø)
src/Widget/ButtonGroup.php	100.00% <ø> (ø)
src/Widget/CheckboxList/CheckboxItem.php	100.00% <ø> (ø)
src/Widget/RadioList/RadioItem.php	100.00% <ø> (ø)
src/Html.php	100.00% <100.00%> (+0.39%)	⬆️
src/NoEncode.php	100.00% <100.00%> (ø)
src/Tag/Base/ListTag.php	100.00% <100.00%> (ø)
src/Tag/Base/MediaTag.php	100.00% <100.00%> (ø)
... and 8 more

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