https://github.com/awood/hawkins
Hawkins is a Jekyll 3.1+ plugin that incorporates LiveReload into the Jekyll "serve" process.
How to Use
Add the following into your Gemfile
group :jekyll_plugins do gem 'hawkins' end
Then run jekyll liveserve to serve your files. The liveserve commands takes all the arguments that serve does but with a few extras that allow you to specify the port that LiveReload runs on or how long LiveReload will wait. See the --help for more information.