update changelog reflecting v2.2.2 changes

Author: Guardiola31337

CHANGELOG.md

@@ -2,6 +2,14 @@
 
 Mapbox welcomes participation and contributions from everyone.
 
+### v2.2.2
+
+- Adds setter for session rotation time [#544](https://github.com/mapbox/mapbox-java/pull/544)
+
+### v2.2.1
+
+- Updates release script for CircleCI [#541](https://github.com/mapbox/mapbox-java/pull/541)
+
 ### v2.2.0
 
 - Adds ProGuard rules for Optimization and Directions Matrix API [#516](https://github.com/mapbox/mapbox-java/pull/516)