Upgrade jest to allow running tests with node.js 11.11

Before we got the same error es described in
facebook/create-react-app#6591 when node.js
v11.11.0 was used.

Author: Simon Warta

package.json

@@ -89,13 +89,13 @@
     "ws": "^6.1.0"
   },
   "devDependencies": {
-    "@types/jest": "^23.3.2",
+    "@types/jest": "^24.0.11",
     "@types/utf8": "^2.1.6",
     "coveralls": "^3.0.2",
-    "jest": "^23.6.0",
+    "jest": "^24.5.0",
     "jest-dot-reporter": "^1.0.7",
     "memdown": "^3.0.0",
-    "ts-jest": "^23.10.1",
+    "ts-jest": "^24.0.0",
     "ts-node": "^7.0.1",
     "tslint": "^5.12.1",
     "tslint-config-prettier": "^1.17.0",