Add full changelog for 3.0.0

Author: Duncan Hewett

CHANGELOG.md

@@ -2,7 +2,24 @@
 
 ## 3.0.0 (31 Oct 2016)
 
-This major release has many breaking changes. See [UPGRADING](UPGRADING.md) for details.
+Major rewrite/update of the notifier. Changes include:
+
+* Uses [Jackson](https://github.com/FasterXML/jackson-databind) for streaming JSON serialization
+* Logs internally using `org.slf4j.Logger`
+* `Severity` is now an enum instead of a `String`
+* Request information is automatically collected in Servlet API apps
+* JVM runtime, O/S, and locale diagnostics are collected
+* The `Client` object has been renamed to `Bugsnag`
+* The `Event` object has been renamed to `Report`
+* `Report` object is now exposed for ease of attaching diagnostics to error reports
+* Targets Java 1.6
+* Callbacks now support Java 8 lambda syntax 
+* Chaining support added to `Report` methods
+* Can now add a Callback to `Bugsnag.notify` calls
+* Can now change the API key on a per-report basis using Callbacks
+* Error report delivery is now fully swappable via the `Delivery` interface
+
+See [UPGRADING](UPGRADING.md) for upgrade details.
 
 ## 2.0.0 (25 Mar 2016)
 

CONTRIBUTING.md

@@ -57,6 +57,7 @@ Create a Sonatype account:
    * `./gradlew clean release`
      - enter the release version (e.g. `1.2.0`)
      - accept the default development version
+1. Create a release in GitHub
 1. Upload the archives to Sonatype Nexus:
    * `git checkout <TAG_NAME>`
    * `./gradlew clean uploadArchives`