docs: keep only latest changelog entries

Author: lisonge

CHANGELOG.md

@@ -1,6 +1,7 @@
-# Changelog
+# What's Changed
 
-## 0.1.2
+<!-- Keep only the latest release notes here. Do not include a version number or
+append older releases. Replace the entries below when publishing a new release. -->
 
 - Replace the Java/AIDL struct-list parser APIs with file-level parsers that
   return package, filtered imports, and structs.
@@ -9,13 +10,3 @@
 - Generate constants as uninitialized `static` fields so callers do not inline
   compile-time values.
 - Render concrete class methods returning `void` with an empty body.
-
-## 0.1.1
-
-- Support `ClassName()` shorthand for querying all constructor overloads.
-
-## 0.1.0
-
-- Reuse unchanged Android framework source across tags with conditional ETag requests.
-- Share cached representations across the AOSP and android-cs GitHub mirrors.
-- Coalesce concurrent downloads and persist tag-ordered ETag metadata in the SQLite cache.