Edit browserslist configuration

package.json

@@ -1,6 +1,9 @@
 {
 	"browserslist": [
-		"defaults"
+		"> 0.5%",
+		"last 4 versions",
+		"Firefox ESR",
+		"not dead"
 	],
 	"devDependencies": {
 		"@symfony/webpack-encore": "^3.0.0",

postcss.config.js

@@ -1,5 +1,5 @@
 module.exports = {
 	plugins: {
-		autoprefixer: {} // Check browserlist configuration in package.json
+		autoprefixer: {} // Browserlist configuration is defined in package.json
 	}
 }