fix: upgrade jest from 24.0.0 to 24.9.0

Snyk has created this PR to upgrade jest from 24.0.0 to 24.9.0.

See this package in NPM:
https://www.npmjs.com/package/jest

See this project in Snyk:
https://app.snyk.io/org/davidkindler/project/6865432e-9ae7-40aa-ab6d-807d59d4dccc?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -29,7 +29,7 @@
     "file-loader": "0.11.2",
     "fs-extra": "3.0.1",
     "html-webpack-plugin": "2.29.0",
-    "jest": "24.0.0",
+    "jest": "24.9.0",
     "object-assign": "4.1.1",
     "postcss-flexbugs-fixes": "3.3.1",
     "postcss-loader": "2.1.6",