Add yarn-plugin-version-tools to Contrib plugins (#4222)

Co-authored-by: Yarn Bot <[email protected]>

Author: 2 people

packages/gatsby/content/features/plugins.md

@@ -89,4 +89,10 @@ This is just a centralized list of third-party plugins to make discovery easier.
 
 - [**yarn-plugin-envinfo**](https://github.com/TheKnarf/yarn-plugin-envinfo) by [**TheKnarf**](https://github.com/TheKnarf) - yarn plugin so that you can run envinfo in your project. It'll read a project local configuration file so that different projects can ask for different info. Useful for helping new developers when onboarding them into your project.
 
+- [**publishconfig**](https://github.com/alizeait/yarn-plugin-publishconfig) by [**Ali Zeaiter**](https://github.com/alizeait) - Allows extending `publishConfig` to support any property on top of the default ones supported by yarn.
+
+- [**http-proxy**](https://github.com/arontsang/yarn-plugin-http-proxy) by [**Aron Tsang**](https://github.com/arontsang) - yarn plugin that loads a default http Proxy Agent based on the HTTP_PROXY or HTTPS_PROXY environmental variable when running lifecycle script such as `postinstall`. This is useful for allowing postinstall scripts to run in corporate environments where internet access requires an explicit HTTP Connect Proxy.
+
+- [**yarn-plugin-version-tools**](https://github.com/indooorsman/yarn-plugins#yarn-plugin-version-tools) by [**indooorsman**](https://github.com/indooorsman) - yarn plugin that is almost same with `@yarnpkg/plugin-version` but add a **`--preid`** option for bumping **prerelease** version.
+
 If you wrote a plugin yourself, feel free to [open a PR](https://github.com/yarnpkg/berry/edit/master/packages/gatsby/content/features/plugins.md) to add it at the end of this list!