lint with concurrency

Author: kentcdodds

package.json

@@ -30,7 +30,7 @@
     "test:e2e:run": "npm run test:e2e:run --silent --prefix playground",
     "setup": "node ./epicshop/setup.js",
     "setup:custom": "node ./epicshop/setup-custom.js",
-    "lint": "eslint .",
+    "lint": "eslint . --concurrency=auto",
     "format": "prettier --write .",
     "typecheck": "tsc -b",
     "validate:all": "npm-run-all --parallel --print-label --print-name --continue-on-error test:all lint typecheck"