Gemfile: Update RuboCop to version 0.30.1
Gemfile: Update RuboCop to version 0.30.1

onddo/ssl_certificate-cookbook,zuazo/ssl_certificate-cookbook,zuazo/ssl_certificate-cookbook,zuazo-forks/ssl_certificate-cookbook,zuazo-forks/ssl_certificate-cookbook,karlsvec/ssl_certificate-cookbook,karlsvec/ssl_certificate-cookbook,onddo/ssl_certificate-cookbook,zuazo/ssl_certificate-cookbook,criteo-forks/ssl_certificate-cookbook,criteo-forks/ssl_certificate-cookbook,zuazo-forks/ssl_certificate-cookbook,criteo-forks/ssl_certificate-cookbook,onddo/ssl_certificate-cookbook,karlsvec/ssl_certificate-cookbook