Decrease Unit Test Time

Run tests in parallel.  Anecdotally, this cut test time by 50% on my local machine.

Signed-off-by: Ryan Goulding <[email protected]>

package.json

@@ -9,7 +9,7 @@
   "description": "example contracts",
   "main": "index.js",
   "scripts": {
-    "test": "npx hardhat test",
+    "test": "npx hardhat test --parallel",
     "prettier": "prettier --write test/**/*.js && prettier --write test/*/*/*.js && prettier --write deploy/*.js && prettier --write tasks/*.js && prettier --write contracts/**/*.sol && prettier --write contracts/**/**/*.sol && prettier --write contracts/**/**/**/*.sol",
     "lint": "yarn prettier && solhint 'contracts/*.sol' && solhint 'contracts/**/*.sol' && solhint 'contracts/**/**/*.sol' && solhint 'contracts/**/**/**/*.sol'"
   },