chore: release 2.0.4 (#605)

🤖 I have created a release \*beep\* \*boop\*
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### [2.0.4](https://www.github.com/googleapis/nodejs-error-reporting/compare/v2.0.3...v2.0.4) (2021-10-04)


### Bug Fixes

* export ErrorMessage as part of the package ([#604](https://www.github.com/googleapis/nodejs-error-reporting/issues/604)) ([eeb0218](https://www.github.com/googleapis/nodejs-error-reporting/commit/eeb02180691260960438b1fbb42425843aa2d677)), closes [#584](https://www.github.com/googleapis/nodejs-error-reporting/issues/584)
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This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

error-reporting/package.json

@@ -15,7 +15,7 @@
     "test": "mocha --timeout=600000"
   },
   "dependencies": {
-    "@google-cloud/error-reporting": "^2.0.3",
+    "@google-cloud/error-reporting": "^2.0.4",
     "express": "^4.16.3"
   },
   "devDependencies": {