chore(master): release 0.4.0 (#138)

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

Author: release-please[bot]

CHANGELOG.md

@@ -0,0 +1,15 @@
+# Changelog
+
+## [0.4.0](https://github.com/GoogleCloudPlatform/grpc-gcp-node/compare/v0.3.3...v0.4.0) (2022-04-06)
+
+
+### Features
+
+* add ability to periodically request debug headers ([#139](https://github.com/GoogleCloudPlatform/grpc-gcp-node/issues/139)) ([e551d92](https://github.com/GoogleCloudPlatform/grpc-gcp-node/commit/e551d92cc73909fadd3df3f541be6870137bd24c))
+* add configuration for minimum number of channels ([#136](https://github.com/GoogleCloudPlatform/grpc-gcp-node/issues/136)) ([2140577](https://github.com/GoogleCloudPlatform/grpc-gcp-node/commit/2140577e897391712215766567dd85226945b56a))
+
+
+### Bug Fixes
+
+* add a stub implementation of channelz in the channel pool to fix compilation ([#137](https://github.com/GoogleCloudPlatform/grpc-gcp-node/issues/137)) ([a05c3dd](https://github.com/GoogleCloudPlatform/grpc-gcp-node/commit/a05c3dddeda6a31981d4124f2279f27f818c5c5a))
+* **deps:** update dependency argparse to v2 ([#93](https://github.com/GoogleCloudPlatform/grpc-gcp-node/issues/93)) ([fd9ed4a](https://github.com/GoogleCloudPlatform/grpc-gcp-node/commit/fd9ed4a9a5f50d87c77da6e98227f580bc70595e))

package.json

@@ -1,6 +1,6 @@
 {
   "name": "grpc-gcp",
-  "version": "0.3.3",
+  "version": "0.4.0",
   "description": "Extension for supporting Google Cloud Platform specific features for gRPC.",
   "main": "build/src/index.js",
   "scripts": {