Conflict of single-letter command line option "-R" with pytest-remotedata plugin

[miurahr]

pytest-leaks defines single letter option "-R". Unfortunately pytest-remotedata plugin also define it.
It is better to avoid define single letter option because of conflict.

Here is an example.
miurahr/aqtinstall#634 (comment)

Could you remove a "-R" single letter option?

[miurahr]

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