chore(build): add `postcss-preset-env` to inject polyfills

Gruntfile.coffee

@@ -1,7 +1,9 @@
 module.exports = (grunt) ->
-  require('load-grunt-tasks')(grunt)
+  # Load Grunt Tasks
+  require('load-grunt-tasks') grunt
 
-  grunt.initConfig(
+  # Project Configuration
+  grunt.initConfig
     # NPM Package Declare
     pkg: grunt.file.readJSON('package.json')
     # Sass Compile
@@ -26,19 +28,23 @@ module.exports = (grunt) ->
           annotation: 'dist/'
       exp:
         options:
-          processors: [require('autoprefixer')()]
+          processors: [
+            require('postcss-preset-env')()
+            require('autoprefixer')()
+          ]
         src: 'dist/bundle.css'
         dest: 'dist/bundle.css'
       min:
         options:
           processors: [
+            require('postcss-preset-env')()
             require('autoprefixer')()
-            require('cssnano')(
-              preset: 'default'
-            )
+            require('cssnano')(preset: 'default')
           ]
         src: 'dist/bundle.min.css'
         dest: 'dist/bundle.min.css'
-  )
-
-  grunt.registerTask('build', ['sass', 'postcss'])
+  # Register Grunt Tasks
+  grunt.registerTask 'build', [
+    'sass'
+    'postcss'
+  ]

package.json

@@ -49,6 +49,7 @@
     "grunt-sass": "^3.1.0",
     "load-grunt-tasks": "^5.1.0",
     "postcss": "^8.4.21",
+    "postcss-preset-env": "^8.0.1",
     "stylelint": "^15.2.0",
     "stylelint-config-standard-scss": "^7.0.1",
     "stylelint-order": "^6.0.2",