Add Adorkable/swift-log-format-and-pipe to Backend list (apple#83)

LoggingFormatAndPipe provides a Swift Logging API Handler which allows you to customized both your log messages' formats as well as their destinations.

README.md

@@ -58,7 +58,8 @@ For further information, please check the [API documentation][api-docs].
 
 As the API has just launched, not many implementations exist yet. If you are interested in implementing one see the "Implementation considerations" section below explaining how to do so. List of existing SwiftLog API compatible libraries:
 
-- [ianpartridge/swift-log-**syslog**](https://github.com/ianpartridge/swift-log-syslog) – a [syslog](https://en.wikipedia.org/wiki/Syslog) backend,
+- [ianpartridge/swift-log-**syslog**](https://github.com/ianpartridge/swift-log-syslog) – a [syslog](https://en.wikipedia.org/wiki/Syslog) backend
+- [Adorkable/swift-log-**format-and-pipe**](https://github.com/Adorkable/swift-log-format-and-pipe) – a backend that allows customization of the output format and the resulting destination
 - Your library? [Get in touch!](https://forums.swift.org/c/server)
 
 ## What is an API package?