Add Dependency scanner and test coverage badge.

[Fcmam5]

As a toolcoholic, I suggest adding these integrations:

• Snyk.io
• Stryker
• Any codecoverage tool

All these tools should provide badges for README files, it would be nice to add them as well 😄 .

Why?

• Because it's cool :)
• We try to make this library useful, secure and stable for all consumers.