minor #2010 NoExtraConsecutiveBlankLinesFixer - SF rule set, add 'extra' (SpacePossum)
minor #2010 NoExtraConsecutiveBlankLinesFixer - SF rule set, add 'extra' (SpacePossum)

This PR was squashed before being merged into the 2.0-dev branch (closes #2010).

Discussion
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NoExtraConsecutiveBlankLinesFixer - SF rule set, add 'extra'

for ref. https://github.com/FriendsOfPHP/PHP-CS-Fixer/issues/1920

Commits
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46e7c2e NoExtraConsecutiveBlankLinesFixer - SF rule set, add 'extra'

SpacePossum/PHP-CS-Fixer,gharlan/PHP-CS-Fixer,kubawerlos/PHP-CS-Fixer,lucasmichot/PHP-CS-Fixer,gharlan/PHP-CS-Fixer,Soullivaneuh/PHP-CS-Fixer,lucasmichot/PHP-CS-Fixer,FriendsOfPHP/PHP-CS-Fixer,SpacePossum/PHP-CS-Fixer,Slamdunk/PHP-CS-Fixer,kubawerlos/PHP-CS-Fixer,GrahamCampbell/PHP-CS-Fixer,FriendsOfPHP/PHP-CS-Fixer,Soullivaneuh/PHP-CS-Fixer,keradus/PHP-CS-Fixer,Slamdunk/PHP-CS-Fixer,felixgomez/PHP-CS-Fixer,GrahamCampbell/PHP-CS-Fixer,felixgomez/PHP-CS-Fixer,keradus/PHP-CS-Fixer