Incorrect peer dependency for Webpack v3.0.0

I have received this message during dependencies update:

```
warning "chunk-manifest-webpack-plugin@1.1.0" has incorrect peer dependency "webpack@^2.0.0 || ^2.1.0-beta || ^2.2.0-rc".
```
I've been using the plugin for the while and has worked without problems. 

I don't know if there will be a push soon regarding this, but if not, I can prepare a PR. 

I'll wait for comments. 