Add changelog

To keep track of the changes

changelog.md

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+# Changelog
+
+### 1.8.0 (unreleased)
+
+* Qualify log statements with "phabricator:"
+* Send a Harbormaster URI Artifacts for the Jenkins build  (Chris Burroughs)
+* Clean up internal Harbormaster API
+* Make the Cobertura plugin an optional dependency (only used for Uberalls)
+* Consistently set defaults for notifiers (Chris Burroughs)
+* Increase unit test coverage to >85%
+
+### 1.7.2 (2015/08/13)
+
+* Fix HTML escaping on build summary view (regression from auto-escape in 1.7.1)
+
+### 1.7.1 (2015/08/13)
+
+* Fix class loading error in Apache HTTP client
+* Bump minimum required Jenkins version to 1.609.2 (from 1.609) so that class exclusions work for above fix
+* Add escape-by-default to Jelly templates
+* Re-enable Javadoc step
+
+### 1.7 (2015/08/12)
+
+* Conduit token and Phabricator URL are now configured via the [Credentials plugin|https://wiki.jenkins-ci.org/display/JENKINS/Credentials+Plugin]
+* Harbormaster messages are now sent over conduit (no more `arc` dependency)
+* Removed deprecated "uber-dot-arcanist" functionality
+* Removed unused JNA and trove4j dependencies
+* Various bugfixes
+* Major refactoring and testing
+
+### 1.6.1 (2015/06/15)
+
+* Update wiki path for plugin
+
+### 1.6 (2015/06/14)
+
+* Rename plugin from "Phabricator Plugin" to "Phabricator Differential Plugin"
+* Add checkbox to control "Build Started" comments being posted to Phabricator
+
+### 1.5 (2015/06/09)
+
+* Handle invalid responses from conduit