Enhancement: add browserslist configuration

.browserslistrc

@@ -0,0 +1,8 @@
+# Browsers that we support:
+# https://browserl.ist/?q=last+2+major+versions%2C+%3E+1%25%2C+not+dead%2C+IE+11%2C+Firefox+ESR
+
+last 2 major versions
+> 1%
+not dead
+IE 11
+Firefox ESR

README.md

@@ -65,4 +65,8 @@ As this is a Django project, you may find the admin panel at `<kpi base url>/adm
 
 Icons
 -----
-All project icons are kept in `jsapp/svg-icons/`. Adding new icon requires adding new `svg` file here and regenerating icons with `npm run generate-icons`. Filenames are used for icon font classnames, e.g. `.k-icon-arrow-last` for `arrow-last.svg` (please use kebab-case). You can see all available icons by running `npm run show-icons` - it will open a list in your browser.
+All project icons are kept in `jsapp/svg-icons/`. Adding new icon requires adding new `svg` file here and regenerating icons with `npm run generate-icons`. Filenames are used for icon font classnames, e.g. `.k-icon-arrow-last` for `arrow-last.svg` (please use kebab-case). You can see all available icons by running `npm run show-icons` - it will open a list in your browser.
+
+Supported Browsers
+------------------
+See [browsers list config](./.browserslistrc)

webpack/webpack.common.js

@@ -25,7 +25,7 @@ var defaultOptions = {
       },
       {
         test: /\.css$/,
-        use: ['style-loader', 'css-loader']
+        use: ['style-loader', 'css-loader', 'postcss-loader']
       },
       {
         test: /\.scss$/,