License code style: prettier

Chrome extension that adds a tweet button to GitHub repo pages.

The tweet buttons looks like this:

• Clone or download this repo
• Browse to chrome://extensions/
• Check "Developer mode" if it isn't already checked
• Press "Load unpacked extension..."
• Select the github-tweet-button/extension folder
• That's it!

• Octopus by Carol Costa from the Noun Project
• Bird by Noe Araujo from the Noun Project