[firebase-release] Removed change log and reset repo after 0.2.0 release

Author: bkendall

CHANGELOG.md

@@ -1,4 +0,0 @@
-* [breaking] Update peer dependency requirement for *firebase-functions* to be v2.0.0 or above, and for *firebase-admin* to be v6.0.0 or above.
-* Support scheduled functions (pull request #51).
-* Support null value in `test.database.makeDataSnapshot` (issue #48).
-* Support `rawRequest` in the callable context object for a wrapped HTTP Callable function (issue #41).