Update dependency ts-jest to v25.2.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ts-jest (source)	devDependencies	minor	25.1.0 -> 25.2.0

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Release Notes

kulshekhar/ts-jest

### [`v25.2.0`](https://togithub.com/kulshekhar/ts-jest/blob/master/CHANGELOG.md#​2520httpsgithubcomkulshekharts-jestcomparev2510v2520-2020-02-03) [Compare Source](https://togithub.com/kulshekhar/ts-jest/compare/v25.1.0...v25.2.0) ##### Bug Fixes - **config:** comment out unused codes ([dff1332](https://togithub.com/kulshekhar/ts-jest/commit/dff1332)) - **config:** pass plain config object to babel-jest transformer ([e0895da](https://togithub.com/kulshekhar/ts-jest/commit/e0895da)) - **config:** remove unused codes ([7aa3928](https://togithub.com/kulshekhar/ts-jest/commit/7aa3928)) - **config:** remove unused import ([81897e1](https://togithub.com/kulshekhar/ts-jest/commit/81897e1)) - **test:** improve unit tests for babel config ([ebd9380](https://togithub.com/kulshekhar/ts-jest/commit/ebd9380)) - **test:** update snapshot ([0e1190d](https://togithub.com/kulshekhar/ts-jest/commit/0e1190d))

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