CHANGELOG.md in mongoid-locker-0.3.0 vs CHANGELOG.md in mongoid-locker-0.3.1

@@ -1,6 +1,10 @@
 # Changelog
 
+## 0.3.1 ([diff](https://github.com/afeld/mongoid-locker/compare/v0.3.0...v0.3.1?w=1))
+
+* fixed race condition, `undefined method '-' for nil:NilClass` - #18
+
 ## 0.3.0 ([diff](https://github.com/afeld/mongoid-locker/compare/v0.2.1...v0.3.0?w=1))
 
 * change exception class to be `Mongoid::Locker::LockError` - #8
 * drop support for Rubinius 1.8-mode, since it seems to be [broken w/ Mongoid 2.6](https://travis-ci.org/mongoid/mongoid/jobs/4594000)
 * relax dependency on Mongoid - #12