Revert "1.9.3 support for Rubocop"
Revert "1.9.3 support for Rubocop"

This reverts commit 165b554958ec412941b0ea55fd9de2870c9e9480.

kenichi/celluloid,seuros/celluloid,TiagoCardoso1983/celluloid,davydovanton/celluloid,celluloid/celluloid,marshall-lee/celluloid,olleolleolle/celluloid,jasonm23/celluloid,dilumn/celluloid,sideci-sample/sideci-sample-celluloid