[turf] Update change log.

Author: pengdev

CHANGELOG.md

@@ -6,6 +6,7 @@ Mapbox welcomes participation and contributions from everyone.
 
 - Added intersection search support to MapboxGeocoding [#1074](https://github.com/mapbox/mapbox-java/pull/1074)
 - Added support for Turf polygonToLine method [#1075](https://github.com/mapbox/mapbox-java/pull/1075)
+- Added support for Turf area measurement method [#1079](https://github.com/mapbox/mapbox-java/pull/1079)
 
 ### v4.9.0-alpha.1 - September 4, 2019
 

docs/turf-port.md

@@ -8,7 +8,7 @@ Below's an on going list of the Turf functions which currently exist inside the
 
 ## Measurement
 - [x] turf-along
-- [ ] turf-area
+- [x] turf-area
 - [x] turf-bbox
 - [x] turf-bbox-polygon
 - [x] turf-bearing