chore(package): update @types/jest to version 24.0.21

Closes #6

Author: greenkeeper[bot]

package.json

@@ -73,7 +73,7 @@
   "devDependencies": {
     "@commitlint/cli": "^7.1.2",
     "@commitlint/config-conventional": "^7.1.2",
-    "@types/jest": "^23.3.2",
+    "@types/jest": "^24.0.21",
     "@types/node": "^10.11.0",
     "colors": "^1.3.2",
     "commitizen": "^3.0.0",