Remove nyc and istanbul

Author: bigmontz

packages/neo4j-driver/.babelrc

@@ -6,12 +6,5 @@
   ],
   "plugins": [
     "@babel/plugin-transform-runtime",
-  ],
-  "env": {
-    "test": {
-      "plugins": [
-        "istanbul"
-      ]
-    }
-  }
+  ]
 }