Integrate David badge to README.md

[terriann]

David will look at the packaged dependencies (and dev dependencies) to tell you when you're up to date, out of date or insecure.

Discovered while poking around in dwyl/learn-nightwatch

Resources

• https://david-dm.org

[terriann]

Alternative package version checker: VersionEye.com - https://www.versioneye.com/

[terriann]

I get why it's never loading a response; the badge may be for only the dependencies and not dev-dependencies. This project only has dev-dependencies:

• https://david-dm.org/terriann/CsvToPlainTextTable
• https://david-dm.org/terriann/CsvToPlainTextTable?type=dev