build(deps-dev): bump ts-loader from 8.0.14 to 8.0.15 in /html (#597)

build(deps-dev): bump ts-loader from 8.0.14 to 8.0.15 in /html (#597)

Bumps [ts-loader](https://github.com/TypeStrong/ts-loader) from 8.0.14 to 8.0.15.
- [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/v8.0.14...v8.0.15)

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