Include Jekyll in install instructions

Author: twilco

README.md

@@ -5,8 +5,8 @@ Welcome!  This repository houses the code for [my blog](https://twilco.github.io
 #### Running locally:
 
 1. Ensure you have Ruby 2.1.0 or higher installed - `ruby --version`
-2. Install bundle - `gem install bundle`
-3. Use bundler to install packages required for the project (which should include Jekyll) - `bundle`
+2. Install bundle and Jekyll - `gem install bundle jekyll`
+3. Use bundler to install packages required for the project - `bundle`
 4. Use Jekyll to serve the site at [localhost:4000](http://localhost:4000) - `jekyll serve`
 
 Feel free to open an issue or PR for anything you find that needs fixing, or if you enjoyed a specific post and want to see more like it.