bump version to prevent eslint errors

got bumped in react-sdk, missed here

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

package.json

@@ -110,7 +110,7 @@
     "eslint-config-google": "^0.7.1",
     "eslint-plugin-babel": "^4.1.1",
     "eslint-plugin-flowtype": "^2.30.0",
-    "eslint-plugin-react": "^6.9.0",
+    "eslint-plugin-react": "^7.4.0",
     "expect": "^1.16.0",
     "fs-extra": "^0.30.0",
     "html-webpack-plugin": "^2.24.0",