BREAKING CHANGE: Bump @types/jest from 24.9.0 to 24.9.1

This change is not compatible with node version < 8.

Bumps [@types/jest](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/jest) from 24.9.0 to 24.9.1.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/jest)

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

Bump jest and ts-jest

Bumps [jest](https://github.com/facebook/jest) and [ts-jest](https://github.com/kulshekhar/ts-jest). These dependencies needed to be updated together.

Updates `jest` from 24.9.0 to 25.1.0
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](jestjs/jest@v24.9.0...v25.1.0)

Updates `ts-jest` from 24.3.0 to 25.0.0
- [Release notes](https://github.com/kulshekhar/ts-jest/releases)
- [Changelog](https://github.com/kulshekhar/ts-jest/blob/master/CHANGELOG.md)
- [Commits](kulshekhar/ts-jest@v24.3.0...v25.0.0)

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

.circleci/config.yml

@@ -2,7 +2,7 @@ version: 2
 jobs:
   build:
     docker:
-      - image: circleci/node:7.10
+      - image: circleci/node:8.10
 
     working_directory: ~/repo
 

README.md

@@ -1,4 +1,4 @@
-# Datetoken [![CircleCI](https://circleci.com/gh/sonirico/datetoken.js.svg?style=svg)](https://circleci.com/gh/sonirico/datetoken.js)
+# Datetoken [![CircleCI](https://circleci.com/gh/sonirico/datetoken.js.svg?style=svg)](https://circleci.com/gh/sonirico/datetoken.js) [![Dependabot Status](https://api.dependabot.com/badges/status?host=github&repo=sonirico/datetoken.js)](https://dependabot.com)
 
 ## Motivation