Bump eslint-plugin-flowtype from 5.2.0 to 5.4.0

Bumps [eslint-plugin-flowtype](https://github.com/gajus/eslint-plugin-flowtype) from 5.2.0 to 5.4.0.
- [Release notes](https://github.com/gajus/eslint-plugin-flowtype/releases)
- [Commits](gajus/eslint-plugin-flowtype@v5.2.0...v5.4.0)

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

Author: dependabot[bot]

package-lock.json

@@ -42,7 +42,7 @@
     "eslint-config-airbnb-base": "~14.2.0",
     "eslint-import-resolver-webpack": "~0.13.0",
     "eslint-loader": "~4.0.0",
-    "eslint-plugin-flowtype": "~5.2.0",
+    "eslint-plugin-flowtype": "~5.4.0",
     "eslint-plugin-import": "~2.22.0",
     "eslint-plugin-jest": "~24.1.0",
     "flow-bin": "~0.141.0",