chore(deps-dev): bump jest from 24.7.1 to 24.8.0

Bumps [jest](https://github.com/facebook/jest) from 24.7.1 to 24.8.0.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/jest/compare/v24.7.1...v24.8.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

web3.js/package.json

@@ -107,7 +107,7 @@
     "flow-bin": "0.98.1",
     "flow-typed": "2.5.1",
     "fs-file-tree": "1.0.7",
-    "jest": "24.7.1",
+    "jest": "24.8.0",
     "marked": "^0.6.0",
     "prettier": "^1.14.3",
     "rimraf": "2.6.3",