Release 1.1.0

Changed

• Upgrade to Babel 7
• Replace the deprecated webpack-command dependency with the webpack-cli
  dependency (see
  webpack-contrib/webpack-command@be83d80)
• Upgrade @types/node, babel-loader, cache-loader,
  compression-webpack-plugin, css-loader, file-loader, leaflet,
  mini-css-extract-plugin, style-loader, ts-loader, typescript,
  uglifyjs-webpack-plugin, webpack, webpack-bundle-analyzer, and
  webpack-merge dependencies
• Tweak CHANGELOG.md formatting to always use line breaks for long lines
• Update minor version number to reflect upgrade from leaflet 1.3 to
  leaflet 1.4

Fixed

• dev webpack config didn’t declare module.exports
• The build:analyze script didn’t declare a webpack mode; now it extends the
  build:check script, which uses development mode