release 2.7.0

Prepare 2.6.0 release

Prepare 2.5.0 release

Merge branch 'hkdobrev-psr-4'

Prepare 2.4.0 release

Merge pull request willdurand#33 from likeuntomurphy/master

Make quote header regexes lazy to avoid collapsing multiple headers i…

Merge pull request willdurand#32 from pbrzoski/master

Fixed the regex detecting day in date quote header

Merge pull request willdurand#25 from stof/fix_signature_detection

Fixed the regex detecting signatures

Merge pull request willdurand#24 from tobiassjosten/24hrtimefix

Allow 24 hours in quote headers

Prepare 2.2.0 release