Not able to config naming convention for Relay fragments

[chengyin]

Relay recommends <module_name>_<property_name> style naming for fragments. e.g., UserComponent_user. This is neither pascal case nor snake case. As far as I know, there is no way to config the naming convention rule to check for this type (I'd define it as [PascalCase]_[camelCase]). Allowing a custom regex would also work.

[Jugbot]

It is common for react modules to be PascalCase and other modules to be camelCase, so it would be nice to somehow combine this rule with match-document-filename.