Update dtslint to the latest version 🚀 (#92)

Author: greenkeeper[bot]

package-lock.json

@@ -54,7 +54,7 @@
     "@feathersjs/socketio": "^4.0.0-pre.4",
     "@types/elasticsearch": "^5.0.34",
     "chai": "^4.2.0",
-    "dtslint": "^0.8.0",
+    "dtslint": "^0.9.0",
     "elasticsearch": "^15.5.0",
     "eslint": "^6.0.1",
     "mocha": "^6.1.4",