Add webpack 3 to peerDependencies

[chearon]

Hello,

Webpack 3 was just released and I noticed this (as a dependency of karma-webpack) doesn't have version 3 of webpack in peerDependencies. I haven't looked at the source here, but I am at least one data point that can say it is working fine in webpack 3. The list of breaking changes was small.

If you could consider adding || ^3, it'd reduce warnings for those of us who've upgraded. Thanks!

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• Operating System: macOS Sierra
• Node Version: 6
• NPM Version: 3.10.10
• webpack version: 3.0.0
• webpack-dev-middleware Version: 1.10.2

• This is a feature request
• This is a bug

Expected Behavior

Silent install

Actual Behavior

"webpack-dev-middleware@1.10.2" has incorrect peer dependency "webpack@1 || ^2.1.0-beta || ^2.2.0-rc.0".

[shellscape]

Fixed by #200