build(deps-dev): bump ts-loader from 7.0.3 to 7.0.4 (#349)

build(deps-dev): bump ts-loader from 7.0.3 to 7.0.4 (#349)

Bumps [ts-loader](https://github.com/TypeStrong/ts-loader) from 7.0.3 to 7.0.4.
- [Release notes](https://github.com/TypeStrong/ts-loader/releases)
- [Changelog](https://github.com/TypeStrong/ts-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/TypeStrong/ts-loader/compare/v7.0.3...v7.0.4)

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