update accordingly to warning after jekyll update
update accordingly to warning after jekyll update

Configuration file: /Users/rohaut/Sites/mysite/_config.yml
       Deprecation: The 'gems' configuration option has been renamed to 'plugins'. Please update your config file accordingly.

brohaut/brohaut.github.io,brohaut/brohaut.github.io,brohaut/brohaut.github.io