chore: release 3.1.1 (#294)

🤖 I have created a release \*beep\* \*boop\*
---
### [3.1.1](https://www.github.com/googleapis/nodejs-containeranalysis/compare/v3.1.0...v3.1.1) (2021-04-27)


### Bug Fixes

* specify valid go_package option ([#293](https://www.github.com/googleapis/nodejs-containeranalysis/issues/293)) ([84ba201](https://www.github.com/googleapis/nodejs-containeranalysis/commit/84ba201c2d2eb81faf36461cf1ff3bfccf33f5ed))
---


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

Author: release-please[bot]

container-analysis/snippets/package.json

@@ -14,7 +14,7 @@
     "test": "mocha --timeout 100000 test/**.test.js"
   },
   "dependencies": {
-    "@google-cloud/containeranalysis": "^3.1.0",
+    "@google-cloud/containeranalysis": "^3.1.1",
     "@google-cloud/pubsub": "^2.0.0",
     "p-retry": "^4.1.0"
   },