[meta] remove explicit audit level config

See npm/cli#2715

Author: ljharb

.npmrc

@@ -1,4 +1,3 @@
 package-lock=false
-audit-level=high
 allow-same-version=true
 message=v%s

package.json

@@ -14,7 +14,7 @@
 		"test:index": "node test",
 		"test:corejs": "node test/corejs",
 		"test:uglified": "node test/uglified",
-		"posttest": "npx aud --production",
+		"posttest": "aud --production",
 		"lint": "eslint .",
 		"version": "auto-changelog && git add CHANGELOG.md",
 		"postversion": "auto-changelog && git add CHANGELOG.md && git commit --no-edit --amend && git tag -f \"v$(node -e \"console.log(require('./package.json').version)\")\""