Clean up dependencies

node_modules/autoprefixer/lib/hacks/placeholder.js

@@ -1,33 +0,0 @@
-let Selector = require('../selector')
-
-class Placeholder extends Selector {
-  /**
-   * Add old mozilla to possible prefixes
-   */
-  possible() {
-    return super.possible().concat(['-moz- old', '-ms- old'])
-  }
-
-  /**
-   * Return different selectors depend on prefix
-   */
-  prefixed(prefix) {
-    if (prefix === '-webkit-') {
-      return '::-webkit-input-placeholder'
-    }
-    if (prefix === '-ms-') {
-      return '::-ms-input-placeholder'
-    }
-    if (prefix === '-ms- old') {
-      return ':-ms-input-placeholder'
-    }
-    if (prefix === '-moz- old') {
-      return ':-moz-placeholder'
-    }
-    return `::${prefix}placeholder`
-  }
-}
-
-Placeholder.names = ['::placeholder']
-
-module.exports = Placeholder