Use deferred to be full async in retry (#101)

Use deferred to be full async in retry

Merge pull request #93 from php-http/changelog

Prepare for 1.7

v1.6.0 release

Update CHANGELOG.md (#68)

Tagged v1.4.2

Merge pull request #59 from php-http/changelog-1.4.1

Changelog 1.4.1

Tagged v1.4.0

Prepare release

AddHostPlugin supports setting a port

Add debug plugins