__() function is missing

added __() function, otherwise it gives addition option in woocommerce setting under Expedited Order tab in Email type drop down choices.
Adding a link to your blog post :)

Adding a link to your blog post which helps to understand anybody how this plugin works and how to create custom email notification in woocommerce
Improve formatting

link looking much bolder and ugly
Merge pull request #1 from ravinderk/master

Tweaks