Bump flow-bin from 0.121.0 to 0.128.0 in /token-swap/js (#94)

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)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

token-swap/js/package.json

@@ -55,7 +55,7 @@
     "eslint-plugin-react": "^7.11.1",
     "event-emitter": "^0.3.5",
     "express": "^4.16.4",
-    "flow-bin": "0.121.0",
+    "flow-bin": "0.128.0",
     "flow-typed": "^3.0.0",
     "http-server": "^0.12.3",
     "jayson": "^3.0.1",