feat(contentful-import): Update batch lib version

Author: Khaledgarbaya

package.json

@@ -39,7 +39,7 @@
   },
   "dependencies": {
     "bluebird": "^3.3.3",
-    "contentful-batch-libs": "4.4.0",
+    "contentful-batch-libs": "4.6.0",
     "json-stringify-safe": "^5.0.1",
     "lodash": "^4.0.0",
     "npmlog": "^4.0.0",