Update dependency jest to v25.2.6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
jest (source)	devDependencies	patch	25.2.4 -> 25.2.6

---

Release Notes

facebook/jest

### [`v25.2.6`](https://togithub.com/facebook/jest/blob/master/CHANGELOG.md#​2526) [Compare Source](https://togithub.com/facebook/jest/compare/v25.2.4...v25.2.6) ##### Chore & Maintenance - `[*]` 25.2.5 was published without changes from 25.2.4 - 25.2.6 includes all changes from that version.

---

Renovate configuration

:date: Schedule: At any time (no schedule defined).

:vertical_traffic_light: Automerge: Enabled.

:recycle: Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

:no_bell: Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by WhiteSource Renovate. View repository job log here.

[codecov[bot]]

Codecov Report

Merging #58 into master will not change coverage by %. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #58   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines           41        41           
  Branches         3         3           
=========================================
  Hits            41        41