Bump superstruct from 0.8.3 to 0.10.12 in /token/js (#51)

Bumps [superstruct](https://github.com/ianstormtaylor/superstruct) from 0.8.3 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@v0.8.3...v0.10.12)

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

token/js/package.json

@@ -69,7 +69,7 @@
     "react-dom": "^16.5.2",
     "readline-promise": "^1.0.3",
     "semver": "^7.0.0",
-    "superstruct": "^0.8.0",
+    "superstruct": "^0.10.12",
     "watch": "^1.0.2",
     "webpack": "^4.20.2",
     "webpack-cli": "^3.1.1",