fix(v2): fix wrong dependency problem (#1460)

packages/docusaurus-plugin-content-docs/package.json

@@ -8,7 +8,6 @@
   },
   "license": "MIT",
   "dependencies": {
-    "@babel/polyfill": "^7.4.0",
     "@docusaurus/mdx-loader": "^2.0.0-alpha.14",
     "@docusaurus/utils": "^2.0.0-alpha.14",
     "fs-extra": "^7.0.1",
@@ -17,7 +16,7 @@
     "loader-utils": "^1.2.3"
   },
   "peerDependencies": {
-    "@docusaurus/core": "^2.0.0",
+    "@docusaurus/core": "^2.0.0-alpha.14",
     "react": "^16.8.4",
     "react-dom": "^16.8.4",
     "react-router-config": "^5.0.0"

packages/docusaurus-plugin-content-docs/src/__tests__/metadata.test.js

@@ -5,7 +5,6 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import '@babel/polyfill';
 import path from 'path';
 import processMetadata from '../metadata';