v4.0.0

Breaking

• Updated SVGO to v2 which has a new configuration format, update the output.svgo options object to match these changes
• Dropped support for Node.js 8
• Dropped support for Webpack 4

Changed

• The default value for sprite.idify is now a function that strips whitespace to match the HTML5 specification

Fixed

• Timing issues that would result in styles files getting created too late