Update changelog.

CHANGELOG.md

@@ -1,15 +1,46 @@
 # Changelog #
 
-## Version 1.3.0 ##
-
-Date: 2016-05-18
+## Version 2.0.0 ##
+
+Date: ---
+
+This version intend to clean the library from unused and out of context stuff and
+leave only the useful abstractions. This is a list of main changes (mostly
+breaking):
+
+- Removed support for monad transformers. They add too many complex to the
+  implementation but in return adds very low value in context of dynamic languages
+  as is clojure.
+- Removed state, writer, reader and continuation monad namespaces.  They are not
+  very useful in clojure so having them without any particular usefulness it not
+  make sense.
+- Removed `cats.applicative` namespace because it is too many opinionated and not
+  really useful in the real world. The use case vary depending on when that
+  abstraction is used so we encourage users to define their own abstraction with
+  specific behavior for their application.
+- Removed CRDT's labs. It was an experiment and the final sensacion is that is not
+  very useful and in most circumstances the users defines their own datastructures
+  instead of rely on ones from third party packages. So, maintaining them in the
+  code base also does not make sense
+- Removed `lens` and `traversals` namespaces. The first one becomes very useful and
+  is properly externalized as [separated package][1]. The last one, seems like it is
+  not very useful and seems out of context of cats library. If anyone is interested
+  in maintaining it, the code can be extracted from the previos git revisions
+  and released as separated library.
+
+And a list of other changes and contributions:
 
 - Rewrite `cats.labs.channel` integration with core.async combinators (@yanatan16)
 - Add `cats.builtin.lazy-sequence-context` (@muhuk)
 - Fix bug in sequence context's fapply implementation (@muhuk)
 - Performance improvements in sequence context implementation (@muhuk)
 - PersistentList support in sequence context (@muhuk)
-- Add `cats.monad.either/try-either` macro for capturing exceptions as left, values as right (@shmish111)
+- Add `cats.monad.either/try-either` macro for capturing exceptions as left, values
+  as right (@shmish111)
+- Move `promesa.monad` namespace under `cats.labs.promise` ns.
+
+[1]: https://github.com/funcool/lentes
+
 
 ## Version 1.2.1 ##