Add check for stop-color in inline styles

[danielbrodin]

Added a check for "stop-color" inline-styles.

[zeke]

Thanks for the PR! 🌈

I just set up Travis in #3. Can you do a git rebase so we can see CI results on this before shipping?

[danielbrodin]

Done :)

[zeke]

~/git/zeke/get-svg-colors master
$ np minor
 ✔ Prerequisite check
 ✔ Git
 ✔ Cleanup
 ✔ Installing dependencies using npm
 ✔ Running tests
 ✔ Bumping version using npm
 ✔ Publishing package
 ✔ Pushing tags

 get-svg-colors 1.4.0 published 🎉

Thanks again. 👍