Bump eslint-plugin-flowtype from 2.46.1 to 3.10.4

Bumps [eslint-plugin-flowtype](https://github.com/gajus/eslint-plugin-flowtype) from 2.46.1 to 3.10.4.
- [Release notes](https://github.com/gajus/eslint-plugin-flowtype/releases)
- [Commits](gajus/eslint-plugin-flowtype@v2.46.1...v3.10.4)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -56,7 +56,7 @@
     "cross-env": "^5.1.3",
     "css-loader": "^3.2.0",
     "eslint": "^4.18.2",
-    "eslint-plugin-flowtype": "^2.46.1",
+    "eslint-plugin-flowtype": "^3.10.4",
     "eslint-plugin-html": "^4.0.2",
     "flow-bin": "^0.66.0",
     "glob": "^7.1.2",