chore(deps): update dependency jest to v24.0.0-alpha.15 (#81)

Author: renovate[bot]

package.json

@@ -43,7 +43,7 @@
     "flow-bin": "0.91.0",
     "hsu-scripts": "1.0.2",
     "husky": "1.3.1",
-    "jest": "24.0.0-alpha.13",
+    "jest": "24.0.0-alpha.15",
     "lint-staged": "8.1.0",
     "prettier": "1.16.1",
     "react": "16.7.0",