3.0.0

[chrisblossom]

This is an alternate to #145. Only merge one, close other.

Changelog:

• Removed Node 6 support
• Removed webpack 2 support
• cleanOnceBeforeBuildPatterns use emit hook instead of compile
• Do not clean files if webpack errors are present during initial build
• Replaced default export with named export CleanWebpackPlugin

// es modules
import { CleanWebpackPlugin } from 'clean-webpack-plugin';

// common js
const { CleanWebpackPlugin } = require('clean-webpack-plugin');

[codecov-io]

Codecov Report

Merging #144 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #144   +/-   ##
=======================================
  Coverage   98.86%   98.86%           
=======================================
  Files           1        1           
  Lines          88       88           
  Branches       30       30           
=======================================
  Hits           87       87           
  Misses          1        1

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[johnagan]

opted for #145

[johnagan]

np thinks I'm not logged into npm. I'll figure it out when I'm back from vacation 🏖