Release 2.2.6 (#597)

* [android] [auto] Update properties to version 2.2.6 in preparation for build.

* temporarily edit circle script for release

* revert 2.2.6 changes

* updated changelog

Author: Cameron Mace

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 Mapbox welcomes participation and contributions from everyone.
 
+### v2.2.6
+
+- Fix for Matrix source and destination returning null rather than the true value [#588](https://github.com/mapbox/mapbox-java/pull/588)
+- Add optional locationEngine dependencies [#502](https://github.com/mapbox/mapbox-java/pull/502)
+
 ### v2.2.5
 
 - set sdkIdentifier and sdkVersion when pushing turnstile event [#574](https://github.com/mapbox/mapbox-java/pull/574)