Bump happo.io from 3.21.1 to 3.21.2 (#378)

Bumps [happo.io](https://github.com/happo/happo.io) from 3.21.1 to 3.21.2.
- [Release notes](https://github.com/happo/happo.io/releases)
- [Commits](happo/happo.io@v3.21.1...v3.21.2)

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

package.json

@@ -105,7 +105,7 @@
     "fs-extra": "^8.1.0",
     "graphql": "^14.4.2",
     "happo-plugin-typescript": "^1.0.0",
-    "happo.io": "^3.21.1",
+    "happo.io": "^3.21.2",
     "jest": "24.8.0",
     "jest-cli": "24.8.0",
     "postcss-preset-env": "^6.7.0",