Bump flow-bin from 0.121.0 to 0.128.0 in /token-swap/js (#102)

Bumps [flow-bin](https://github.com/flowtype/flow-bin) from 0.121.0 to 0.128.0.
- [Release notes](https://github.com/flowtype/flow-bin/releases)
- [Commits](https://github.com/flowtype/flow-bin/commits)

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