fix yarn audit

package.json

@@ -43,11 +43,11 @@
     "@types/ratelimiter": "^2.1.28",
     "@types/redis": "^2.8.5",
     "@types/sharp": "^0.17.6",
-    "lodash": "^4.17.11",
+    "lodash": "^4.17.12",
     "mocha": "^5.1.1",
     "mocha-junit-reporter": "^1.17.0",
-    "nyc": "^14.0.0",
-    "onchange": "^4.1.0",
+    "nyc": "^14.1.1",
+    "onchange": "^6.1.0",
     "ts-node": "^7.0.0",
     "tslint": "^5.16.0",
     "typescript": "^2.7.1"