Upgrade dependencies.

package.json

@@ -41,12 +41,12 @@
     "useragent-generator": "^1.1.0"
   },
   "devDependencies": {
-    "@types/jest": "^24.0.14",
+    "@types/jest": "^26.0.20",
     "@types/jsdom": "^16.2.3",
-    "jest": "^24.8.0",
+    "jest": "^26.6.3",
     "np": "^5.0.3",
     "prettier": "^1.19.1",
-    "ts-jest": "^24.0.2",
+    "ts-jest": "^26.4.4",
     "tslint": "^5.17.0",
     "tslint-config-airbnb": "^5.11.1",
     "tslint-config-prettier": "^1.18.0",