Update docs

package.json

@@ -1,7 +1,7 @@
 {
   "name": "openzeppelin-solidity",
   "description": "Secure Smart Contract library for Solidity",
-  "version": "4.8.2",
+  "version": "4.9.0",
   "files": [
     "/contracts/**/*.sol",
     "/build/contracts/*.json",
@@ -89,6 +89,7 @@
     "solidity-ast": "^0.4.25",
     "solidity-coverage": "^0.8.0",
     "solidity-docgen": "^0.6.0-beta.29",
+    "undici": "^5.22.1",
     "web3": "^1.3.0",
     "yargs": "^17.0.0"
   }