chore: release 1.4.0 (#107)

🤖 I have created a release \*beep\* \*boop\*
---
## [1.4.0](https://www.github.com/googleapis/nodejs-workflows/compare/v1.3.1...v1.4.0) (2021-11-08)


### Features

* add a stack_trace field to the Error messages specifying where the error occured feat: add call_log_level field to Execution messages doc: clarify requirement to escape strings within JSON arguments ([#106](https://www.github.com/googleapis/nodejs-workflows/issues/106)) ([7ba49ae](https://www.github.com/googleapis/nodejs-workflows/commit/7ba49ae965a80e5a44e7add4d626524635c2f3e1))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

workflows/package.json

@@ -13,7 +13,7 @@
     "test": "c8 mocha --timeout 600000 test/*.js"
   },
   "dependencies": {
-    "@google-cloud/workflows": "^1.3.1"
+    "@google-cloud/workflows": "^1.4.0"
   },
   "devDependencies": {
     "c8": "^7.3.0",