Update changelog

CHANGELOG.md

@@ -1,10 +1,24 @@
-# HEAD
+# Pavlov Changelog
 
-Lots and lots of backwards incompatible breakage.
+## HEAD
+
+This release brings forth lots and lots of incompatibilities. Where possible, we've tried to keep a backwards-compatible API available. You can activate this by requiring `pavlov/alpha_compatibility'.
+
+#### New Stuff:
+
+* Pavlov now uses Virtus for what used to be called `arguments`. Instead of specifying a list of arguments, you can now specify attributes individually, with optional defaults. Check the README on all the cool stuff you can do with these Virtus-based attributes.
+
+#### Deprecations:
+
+If you want to retain deprecated functionality, you can `require 'pavlov/alpha_compatibility'`.
+
+* Deprecated `arguments` in operations.
+* Deprecated `pavlov_options` that were used by the helpers.
+
+#### Completely removed:
 
-* Now using Virtus for what used to be called `arguments`. Check the README on how to use the new `attribute`s.
 * Removed support for `finish_initialize`. Override the `initialize` method and call `super` instead.
 
-# 0.1.0
+## 0.1.0
 
 Initial alpha-release. Here be dragons.