add 'resetColor' method

[jeremylorino]

Based on the issue #13 this PR adds a method that allows the color to be reset.

[desandro]

Hello! Thank you for this contribution. I've recently revamped this project for better testing. If you're still interested in this PR, could you pull the latest and give it another attempt?

• run npm run lint to check for linting; run npm run lintFix for automated lint fixes
• run npm run test to run tests
• Do not edit huebee.pkgd.js. This file gets generated with new releases
• tests now run in puppeteer, not Qunit. Check the other test files to see their structure.

[deepakavvari]

Hi @desandro
Is this functionality available in the latest?
I can't seem to find it anywhere in the documentation.
I really need this functionality to serve my use case.
Thanks!