Bump skynet-js from 0.0.8 to 2.0.4 in /packages/webapp

Bumps [skynet-js](https://github.com/NebulousLabs/skynet-js) from 0.0.8 to 2.0.4.
- [Release notes](https://github.com/NebulousLabs/skynet-js/releases)
- [Changelog](https://github.com/NebulousLabs/skynet-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/NebulousLabs/skynet-js/compare/v0.0.8...v2.0.4)

Signed-off-by: dependabot[bot] <support@github.com>

packages/webapp/package.json

@@ -32,7 +32,7 @@
     "react-mailchimp-subscribe": "2.1.0",
     "react-syntax-highlighter": "13.5.3",
     "react-visibility-sensor": "5.1.1",
-    "skynet-js": "0.0.8",
+    "skynet-js": "2.0.4",
     "typeface-metropolis": "0.0.74"
   },
   "devDependencies": {