chore: update changlog

Author: liximomo

CHANGELOG.md

@@ -1,3 +1,12 @@
+# 0.2.0
+## Fixed
+* `computed` property is called immediately in `reactive()` [#79](https://github.com/vuejs/composition-api/issues/79).
+
+## Changed
+* rename `onBeforeDestroy()` to `onBeforeUnmount()` [lifecycle-hooks](https://vue-composition-api-rfc.netlify.com/api.html#lifecycle-hooks).
+* Remove `onCreated()` [lifecycle-hooks](https://vue-composition-api-rfc.netlify.com/api.html#lifecycle-hooks).
+* Remove `onDestroyed()` [lifecycle-hooks](https://vue-composition-api-rfc.netlify.com/api.html#lifecycle-hooks).
+
 # 0.1.0
 **The package has been renamed to `@vue/composition-api` to be consistent with RFC.**