Update CHANGELOG [skip ci]

sharplet · sharplet · commit 8813c1a4d2bc · 2017-06-15T14:43:29.000-04:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,6 +1,8 @@
 # master
 *Please add new entries at the top.*
 
+1. Added new convenience initialisers to `Action` that make creating actions with state input properties easier. When creating an `Action` that is conditionally enabled based on an optional property, use the renamed `Action.init(unwrapping:execute:)` initialisers. (#455, kudos to @sharplet)
+
 # 2.0.0-alpha.3
 1. `combinePrevious` for `Signal` and `SignalProducer` no longer requires an initial value. The first tuple would be emitted as soon as the second value is received by the operator if no initial value is given. (#445, kudos to @andersio)
 
