Update ts-jest to the latest version � (#768)

Summary:
## The devDependency [ts-jest](https://github.com/kulshekhar/ts-jest) was updated from `24.3.0` to `25.1.0`.
This version is **not covered** by your **current version range**.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

 ---

**Publisher:** [kul](https://www.npmjs.com/~kul)
**License:** MIT

[Find out more about this release](https://github.com/kulshekhar/ts-jest).

 ---

<details>
  <summary>FAQ and help</summary>

  There is a collection of [frequently asked questions](https://greenkeeper.io/faq.html). If those don’t help, you can always [ask the humans behind Greenkeeper](https://github.com/greenkeeperio/greenkeeper/issues/new).
</details>

 ---

Your [Greenkeeper](https://greenkeeper.io) bot 🌴
Pull Request resolved: https://github.com/facebook/flipper/pull/768

Reviewed By: mweststrate

Differential Revision: D19639975

Pulled By: passy

fbshipit-source-id: d3e344d54d76127476c42146e2cc6c4c578d89c8

yarn.lock

@@ -8916,10 +8916,10 @@ truncate-utf8-bytes@^1.0.0:
   dependencies:
     utf8-byte-length "^1.0.1"
 
-ts-jest@^24.1.0:
-  version "24.1.0"
-  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-24.1.0.tgz#2eaa813271a2987b7e6c3fefbda196301c131734"
-  integrity sha512-HEGfrIEAZKfu1pkaxB9au17b1d9b56YZSqz5eCVE8mX68+5reOvlM93xGOzzCREIov9mdH7JBG+s0UyNAqr0tQ==
+ts-jest@^25.1.0:
+  version "25.1.0"
+  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-25.1.0.tgz#06e776c4cce8a4da8eec4945f36a5823d0c0f9ba"
+  integrity sha512-1Lf576ulKhbxX5og+tG8udVg/5cgcMLPBxp1iCqbbf6VvUK4gEsgAtzMjl8u98izhLrzKMPB0LxCBKEZ5l19Hw==
   dependencies:
     bs-logger "0.x"
     buffer-from "1.x"