Remove artifacts from README.md

[MusicOnline]

Removed weird artifacts as a result of copy-pasting from action.yml that went unnoticed for a month. Contributing to Twilio

All third-party contributors acknowledge that any contributions they provide will be made under the same open-source license that the open-source project is provided under.

• [x] I acknowledge that all my contributions will be made under the project's license.

[MusicOnline]

Also, there's inconsistent usage of periods at the end of lines.

[welcome[bot]]

Congratulations to your first contribution to Twilio Labs! We'd love to say thank you and send you some swag. If you are interested please fill out this form at https://twil.io/hacktoberfest-swag If you are on the look out for more ways to contribute to open-source, check out a list of some of our repositories at https://github.com/twilio/opensource. And if you love Twilio as much as we do, make sure to check out our Twilio Champions program! https://www.twilio.com/champions

[dkundel]

Thank you!