Update the changelog.

Author: Jeff Verkoeyen

CHANGELOG.md

@@ -1,7 +1,44 @@
 # #develop#
 
- TODO: Enumerate changes.
+This minor release introduces support for the new [v1.5.0](https://github.com/material-motion/motion-interchange-objc/releases/tag/v1.5.0) MotionInterchange format.
 
+## New features
+
+It is now possible to additively and implicitly animate the `transform` property of both UIView and CALayer.
+
+## Source changes
+
+* [Fix pre-iOS 11 unit test failure. (#89)](https://github.com/material-motion/motion-animator-objc/commit/7e506cc37b7d64d010b69d4996621755ece26595) (featherless)
+* [Migrate to the Objective-C interchange format (#88)](https://github.com/material-motion/motion-animator-objc/commit/573b19269e155f15e05e9b146a1c324b937cfb1c) (featherless)
+* [Revert "Update with ObjC implementation."](https://github.com/material-motion/motion-animator-objc/commit/f55625d9f63e857e878eff4e7687ddd40bad0fea) (Jeff Verkoeyen)
+* [Update with ObjC implementation.](https://github.com/material-motion/motion-animator-objc/commit/be7f9081c0678484e034cc976aafcdab748b58bf) (Jeff Verkoeyen)
+* [Add support for additively animating transform. (#85)](https://github.com/material-motion/motion-animator-objc/commit/e54ce3a118c1e877c5ca78a7d2fed9625d0ffc67) (featherless)
+
+## API changes
+
+Auto-generated by running:
+
+    apidiff origin/stable release-candidate objc src/MotionAnimator.h
+
+#### MDMMotionAnimator
+
+*new* method: `-animateWithTraits:animations:completion:` in `MDMMotionAnimator`
+
+*new* method: `-animateWithTraits:between:layer:keyPath:` in `MDMMotionAnimator`
+
+*new* method: `-animateWithTraits:animations:` in `MDMMotionAnimator`
+
+*new* method: `-animateWithTraits:between:layer:keyPath:completion:` in `MDMMotionAnimator`
+
+#### MDMKeyPathTransform
+
+*new* constant: `MDMKeyPathTransform`
+
+## Non-source changes
+
+* [Update .travis.yml](https://github.com/material-motion/motion-animator-objc/commit/8f474dd545ec1b3e98db5ef783bca502351911e4) (featherless)
+* [Enable coverage on travis](https://github.com/material-motion/motion-animator-objc/commit/45d43aa23a88c963927f4f01669e1b0ae26fb9e5) (featherless)
+* [Update kokoro bazel runner for v4.](https://github.com/material-motion/motion-animator-objc/commit/67d903ed71fbc909ea06bb8097313a4218c8f566) (Jeff Verkoeyen)
 
 # 2.6.0