fix(package): update jest-worker to version 25.4.0

Closes #197

Author: greenkeeper[bot]

package.json

@@ -44,7 +44,7 @@
     "cors": "2.8.5",
     "express": "4.17.1",
     "fast-json-stable-stringify": "2.1.0",
-    "jest-worker": "25.1.0",
+    "jest-worker": "25.4.0",
     "joi": "14.3.1",
     "mime-types": "2.1.26",
     "p-retry": "4.2.0",