Update changelog.

Author: Jeff Verkoeyen

CHANGELOG.md

@@ -1,7 +1,22 @@
-# #develop#
+# 1.5.1
 
- TODO: Enumerate changes.
+This patch release introduces a compatibility initializer for creating Objective-C animation traits from C-style motion timings.
 
+## Source changes
+
+* [Add a legacy initializer for animation traits. (#34)](https://github.com/material-motion/motion-interchange-objc/commit/e3321d0e4081de1f3d8edee115af0a9ea2142c48) (featherless)
+
+## API changes
+
+Auto-generated by running:
+
+    apidiff origin/stable release-candidate objc src/MotionInterchange.h
+
+#### MDMAnimationTraits(Legacy)
+
+*new* method: `-initWithMotionTiming:` in `MDMAnimationTraits(Legacy)`
+
+*new* category: `MDMAnimationTraits(Legacy)`
 
 # 1.5.0