Adds changelog.

Author: robotlolita

CHANGELOG.md

@@ -0,0 +1,23 @@
+## From 1.0.0 to 2.0.0
+
+ -  **BREAKING:** removed partial functions and fields (`toString`, `isEqual`,
+    `isPending`, `isResolved`, `isRejected`), since you can't observe them
+    always, and it leads to confusing behaviour. This functionality will be
+    moved to a co-future later.
+
+ -  **BREAKING:** removed default memoisation. Since the Futures are just
+    placeholders for actions, it does make sense that chaining a Future twice
+    should execute the action twice. When you want memoisation, you can use the
+    `Future.memoise` construct instead of `new Future`.
+
+    ```js
+    // Before:
+    new Future(function(reject, resolve) { ... })
+
+    // Now:
+    Future.memoise(function(reject, resolve) { ... })
+    ```
+
+## 1.0.0
+
+Initial release