build(deps-dev): bump typescript from 3.1.1 to 3.1.2
build(deps-dev): bump typescript from 3.1.1 to 3.1.2

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.1.1 to 3.1.2.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](https://github.com/Microsoft/TypeScript/compare/v3.1.1...v3.1.2)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
kulshekhar/ts-jest,kulshekhar/ts-jest