Bump superstruct from 0.8.4 to 0.10.12 in /token-swap/js (#103)

Bumps [superstruct](https://github.com/ianstormtaylor/superstruct) from 0.8.4 to 0.10.12.
- [Release notes](https://github.com/ianstormtaylor/superstruct/releases)
- [Changelog](https://github.com/ianstormtaylor/superstruct/blob/master/Changelog.md)
- [Commits](ianstormtaylor/superstruct@v0.8.4...v0.10.12)

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