Update autoprefixer list on browser support

gulpfile.js/tasks/styles.js

@@ -18,7 +18,16 @@ var flatten = function(arrOfArr) {
 };
 
 var autoprefixerConfig = {
-    browsers: ['last 3 versions', 'ie 11'],
+    browsers: [
+      'Firefox ESR',
+      'ie 11',
+      'last 2 Chrome versions',
+      'last 2 ChromeAndroid versions',
+      'last 2 Edge versions',
+      'last 1 Firefox version',
+      'last 2 iOS versions',
+      'last 2 Safari versions',
+    ],
     cascade: false,
 };