run hardhat clean before building package to ensure presence of ABIs

Author: ItsNickBarry

package.json

@@ -5,7 +5,7 @@
   "license": "MIT",
   "scripts": {
     "lerna-publish": "yarn build && lerna publish && lerna run tsc-clean",
-    "build": "hardhat compile && lerna run tsc",
+    "build": "hardhat clean && hardhat compile && lerna run tsc",
     "postinstall": "patch-package",
     "prepare": "husky",
     "prettier": "prettier --write --plugin=prettier-plugin-solidity --plugin=@trivago/prettier-plugin-sort-imports .",