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Introduce langohr.http/list-enabled-protocols
Inline
2.7.0
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Remove Langohr version var

It gets too annoying to keep it in sync with project.clj.
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Update README
Revert "Remove Langohr version var"

This reverts commit 52918fddd3ae12664191d155a60db5c60114469f.
Revert "Update change log"

This reverts commit 576b1e198a70a36370da9a7dc05ac59d95520f81.
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2.7.1
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2.7.1 is out