docs(README): add filemanager-webpack-plugin (#78)

Author: gregnb

README.md

@@ -188,6 +188,10 @@ Inspired by the [awesome](https://github.com/sindresorhus/awesome) list. Feel fr
 - [Modules CDN Webpack Plugin](https://github.com/mastilver/modules-cdn-webpack-plugin) - Dynamically load your modules from a CDN. -- *Maintainer*: `Thomas Sileghem` [![Github][githubicon]](https://github.com/mastilver)
 - [Generate package.json Plugin](https://github.com/lostpebble/generate-package-json-webpack-plugin) - Limit dependencies in a deployment `package.json` to only those that are actually being used by your bundle. -- *Maintainer*: `Paul Myburgh` [![Github][githubicon]](https://github.com/lostpebble)
 - [Progressive Web App Manifest](https://github.com/arthurbergmz/webpack-pwa-manifest) - PWA manifest manager and generator. -- *Maintainer*: `Arthur A. Bergamaschi` [![Github][githubicon]](https://github.com/arthurbergmz)
+- [FileManager Webpack Plugin](https://github.com/gregnb/filemanager-webpack-plugin) - Copy, move, delete files and directories before and after Webpack builds -- *Maintainer*: `Gregory Nowakowski` [![Github][githubicon]](https://github.com/gregnb)
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