React eslint not catching the use of underscore with internal methods

In the [React/JSX Styleguide 'Methods' section](https://github.com/airbnb/javascript/blob/master/react/README.md#methods) it says you shouldn't use `_` to prefix internal methods. However, some of my code contains this convention and it isn't being caught by the linter. I double-checked the eslint rules for react/jsx files and there doesn't seem to be a rule defined for this convention.

Is this intentional? If so, why specify the rule in your documentation? I found a related issue (#490), but it wasn't clearly stated whether or not this rule should definitely be adhered to but rather that it's more or less up to the programmer.

Any clarification would be greatly appreciated.

Commencez par la section « Methods » de React/JSX Styleguide dans react/README.md et examinez les règles ESLint existantes pour les fichiers React/JSX. Consultez l’issue #490 associée et déterminez si la convention de l’underscore documentée doit être appliquée ; le travail est considéré comme terminé lorsqu’une politique a été décidée et que les modifications correspondantes de la documentation ou du linting ont été effectuées.

Rédigé par le modèle d'indexation à partir du texte de l'issue.