Clean up old changelogs (#3458)

* clean up changelogs

* qualify version with package name

Author: Feiyang1

packages/database/CHANGELOG.md

@@ -30,23 +30,26 @@
   without transactions.
 - [fixed] Fixed Realtime Database URL parsing bug to support domains with more than 3 components.
 
-# Released
+## 0.5.6
 
 - [fixed] Fixed an issue that caused large numeric values with leading zeros to
   not always be sorted correctly.
+
+## 0.5.3
+
 - [changed] Internal cleanup to Node.JS support.
 
-# 6.4.0
+## 0.5.0
 
 - [fixed] Fixed an issue that caused `.info/serverTimeOffset` events not to fire (#2043).
 - [changed] Treat `ns` url query parameter as the default Realtime Database
   namespace name.
 
-# 6.3.4
+## 0.4.11
 
 - [fixed] Fixed an issue where multi-byte UTF-8 characters would not be written correctly when using `firebase.js` or `firebase-database.js` (#2035).
 
-# 6.0.0
+## 0.4.0
 
 - [changed] Improved consistency between the type annotations for `Query.on`/`Reference.on`,
   `Query.off`/`Reference.off` and `Query.once`/`Reference.once` (#1188, #1204).