Add changelog entry for version 2.0.2. (#1873)

* Add changelog entry for version 2.0.2.

* Address review comments.

Author: mbarbella-chromium

CHANGELOG.md

@@ -1,6 +1,17 @@
 Change Log
 ==========
 
+## Version 2.0.2
+- Improved Syzkaller support.
+- Support narrower bisection for regression/fix ranges.
+- Improve Rust crash detection signatures.
+- Improved Android KASan support.
+- Batch datastore operations more aggressively.
+- Improved grouping of crashes involving inline frames.
+- Enable entropic fuzzing strategy in libFuzzer.
+- Test past crash regressions in corpus pruning task.
+- Various bug fixes.
+
 ## Version 2.0.1
 - Various bug fixes.