Bumps [babel-plugin-istanbul](https://github.com/istanbuljs/babel-plugin-istanbul) from 6.1.1 to 7.0.0.
- [Release notes](https://github.com/istanbuljs/babel-plugin-istanbul/releases)
- [Changelog](https://github.com/istanbuljs/babel-plugin-istanbul/blob/master/CHANGELOG.md)
- [Commits](https://github.com/istanbuljs/babel-plugin-istanbul/compare/v6.1.1...v7.0.0)

---
updated-dependencies:
- dependency-name: babel-plugin-istanbul
  dependency-type: direct:development
  update-type: version-update:semver-major
...
Signed-off-by: dependabot[bot] <support@github.com>