Updates changelog (#425)

* updated changelog

* updated and made requested changes

* made few typo fixes

* added links to changlog

* added missing PR link

* reformat CHANGELOG

Author: Cameron Mace

CHANGELOG.md

@@ -2,6 +2,19 @@
 
 Mapbox welcomes participation and contributions from everyone.
 
+### v2.1.0
+
+* The Mapbox Navigation SDK for Android has been moved into its own repository. Code and tickets can now be followed on [mapbox-navigation-android](https://github.com/mapbox/mapbox-navigation-android) [#439](https://github.com/mapbox/mapbox-java/pull/439)
+* Introduced support for the [Optimized Trips API](https://www.mapbox.com/api-documentation/#optimized-trips) [#437](https://github.com/mapbox/mapbox-java/pull/437)
+* Added support for the [Directions Matrix API](https://www.mapbox.com/api-documentation/#directions-matrix). This replaces the Distance API [#418](https://github.com/mapbox/mapbox-java/pull/418), which is now deprectated [#405](https://github.com/mapbox/mapbox-java/pull/405)
+* Added support for direction [annotations](https://github.com/mapbox/mapbox-java/blob/master/mapbox/libjava-services/src/main/java/com/mapbox/services/api/directions/v5/MapboxDirections.java#L345-L358) [#417](https://github.com/mapbox/mapbox-java/pull/417)
+* Added `setInterval`, `setFastestInterval` and `setSmallestDisplacement` to allow configurable [LocationEngine](https://github.com/mapbox/mapbox-java/blob/master/mapbox/libandroid-telemetry/src/main/java/com/mapbox/services/android/telemetry/location/LocationEngine.java) parameters [#402](https://github.com/mapbox/mapbox-java/pull/402)
+* Added setters in `DirectionsResponse` to simplify object creation [#422](https://github.com/mapbox/mapbox-java/pull/422)
+* Added `weight` and `weight_name` support to the Directions API response [#438](https://github.com/mapbox/mapbox-java/pull/438)
+* Fixed issue where some coordinates were overwritten when setting all origin, destination and a coordinates list inside the directions builder [#420](https://github.com/mapbox/mapbox-java/pull/420)
+* Fixed bug when using `TurfMisc.pointOnLine()` where incorrect warnings would state your `Position` values were outside the recommended range [#416](https://github.com/mapbox/mapbox-java/pull/416)
+* Enhanced coordinates formatting to remove trailing zeros [#424](https://github.com/mapbox/mapbox-java/pull/424)
+
 ### v2.0.0 - March 17th, 2017
 
 * Mapbox Navigation SDK [#346](https://github.com/mapbox/mapbox-java/pull/346)