Add react and react-dom as peer dependencies (#345)

Fixes errors using Yarn 2 (berry).

See ant-design/ant-design#27339 for details.

Author: brandonbloom

package.json

@@ -67,5 +67,9 @@
     "react": "^16.9.0",
     "react-dom": "^16.9.0",
     "typescript": "^4.0.2"
+  },
+  "peerDependencies": {
+    "react": ">=16.9.0",
+    "react-dom": ">=16.9.0"
   }
 }