Update Javabrake version to 0.2.0

[thompiler]

Javabrake has a new version: 0.2.0

https://github.com/airbrake/javabrake/releases

This version updates how the notifier is configured (it uses a config object to initialize the notifier instead of passing in the key and ID directly) so this should update this logback library from 0.1.1 to 0.2.0.

[luisgsotoaboal]

Version 0.1.2 solves this (among other things):

logback/src/main/java/io/airbrake/logback/AirbrakeAppender.java

Line 44 in 91f0dc2

this.notifier = new Notifier(config);

However, since 0.1.2 has not yet been published to Maven, we cannot use it. There's an open issue for that too #14

[luisgsotoaboal]

@mmcdaris Now that 0.1.2 is out and #14 is closed, I think you can close this one as well 👍 Thanks a lot!