Add arango-test command

Author: pluma

package.json

@@ -47,6 +47,7 @@
     "lib/cjs/util/*.*"
   ],
   "scripts": {
+    "arango-test": "mocha --reporter json --require source-map-support/register --timeout 30000 lib/async/test",
     "test": "mocha --reporter spec --require source-map-support/register --timeout 10000 lib/async/test",
     "pretest": "yarn dist",
     "ci": "mocha --reporter spec --require source-map-support/register --timeout 30000 lib/cjs/test",