Bump tslib from 2.6.2 to 2.7.0 (#294)

Bumps [tslib](https://github.com/Microsoft/tslib) from 2.6.2 to 2.7.0.
- [Release notes](https://github.com/Microsoft/tslib/releases)
- [Commits](microsoft/tslib@v2.6.2...v2.7.0)

---
updated-dependencies:
- dependency-name: tslib
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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