[firebase-release] Removed change log and reset repo after 4.0.0 release

Author: google-oss-bot

CHANGELOG.md

@@ -1,32 +0,0 @@
-### Breaking Changes
-
-- Deprecated `allowInvalidAppCheckToken` option. Instead use
-  `enforceAppCheck`.
-
-> App Check enforcement on callable functions is disabled by default in v4.
-> Requests containing invalid App Check tokens won't be denied unless you
-> explicitly enable App Check enforcement using the new `enforceAppCheck` option.
-> Furthermore, when enforcement is enabled, callable functions will deny
-> all requests without App Check tokens.
-
-- Dropped support for Node.js versions 8, 10, and 12.
-- Dropped support for Admin SDK versions 8 and 9.
-- Removed the `functions.handler` namespace.
-- `DataSnapshot` passed to the Firebase Realtime Database trigger now
-  matches the `DataSnapshot` returned by the Admin SDK, with null values
-  removed.
-- Removed `__trigger` object on function handlers.
-- Reorganized source code location. This affects only apps that directly import files instead of using the recommend entry points specified in the
-- Reworked the `apps` library and removed `lodash` as a runtime dependency.
-
-### Enhancements
-
-- Logs created with the `functions.logger` package in v2 functions
-  are now annotated with each request's trace ID, making it easy to correlate
-  log entries with the incoming request. Trace IDs are especially useful for
-  cases where 2nd gen's concurrency feature permits a function
-  to handle multiple requests at any given time. See
-  [Correlate log entries](https://cloud.google.com/logging/docs/view/correlate-logs) to learn more.
-- `functions.logger.error` now always outputs an error object and is included in Google Cloud Error Reporting.
-- The logging severity of Auth/App Check token validation has changed from `info` to `debug` level.
-- Event parameters for 2nd generation functions are now strongly typed, permitting stronger TypeScript types for matched parameters.