Remove references to --dev-only
install option
#5771
Merged
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According to @finswimmer in #4864 (comment):
Given that the option was only ever present when installing Poetry from master and was never available as part of a release, I think it's clearer to just remove all references to it rather than include a deprecation notice that would only be relevant to a tiny fraction of Poetry users.
Pull Request Check List
Resolves: #4864
Added tests for changed code.