Update license in rubygems

[ioanatia]

The gem currently does not have a listed license in rubygems.

rack-accept is a direct dependency of widely used gems like grape.

The fact that rack-accept does not have a listed license in rubygems, makes it difficult if not impossible to use in environments with strict license checks.

Would it be possible to update the license in rubygems? Would this require a new release of this gem?

[anothermh]

@mjackson You merged #16 in 2015 but did not bump the version and publish the change to rubygems. Any chance that you can do that?

The papers gem from New Relic reports this gem as being under an unknown license, for example:

License validation failed:
Gem rack-accept-0.4.5 is licensed under Unknown, which is not whitelisted

Not having this change published can complicate the automation of license-compliance checks in CI systems.