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First beta release of the 7.x release branch.

Major changes:

• PSR-18 support
• Dropped PHP 5.x support

Enjoy!

Many thanks to everyone who worked on this release, especially:

• @Nyholm
• @gmponos
• @alexeyshockov
• @GrahamCampbell

• idn_to_ascii() fix for old PHP versions #2489

• Better defaults for PHP installations with old ICU lib #2454
• IDN support for redirects #2424

• Bug fix: Parsing 0 epoch expiry times in cookies #2014
• Improvement: Better ConnectException detection #2012
• Bug fix: Malformed domain that contains a "/" #1999
• Bug fix: Undefined offset when a cookie has no first key-value pair #1998
• Improvement: Support PHPUnit 6 #1953
• Bug fix: Support empty headers #1915
• Bug fix: Ignore case during header modifications #1916

• Minor code cleanups, documentation fixes and clarifications.

• Feature: force IP resolution (ipv4 or ipv6) #1608, #1659
• Improvement: Don't include summary in exception message when body is empty #1621
• Improvement: Handle on_headers option in MockHandler #1580
• Improvement: Added SUSE Linux CA path #1609
• Improvement: Use class reference for getting the name of the class instead of using hardcoded strings #1641
• Feature: Added read_timeout option #1611
• Bug fix: PHP 7.x fixes #1685, #1686, #1811
• Deprecation: BadResponseException instantiation without a response #1642
• Feature: Added NTLM auth #1569
• Feature: Track redirect HTTP status codes #1711
• Improvement: Check handler type during construction #1745
• Improvement: Always include the Content-Length if there's a body #1721
• Feature: Added convenience method to access a cookie by name #1318
• Bug fix: Fill CURLOPT_CAPATH and CURLOPT_CAINFO properly #1684
• Improvement: Use \GuzzleHttp\Promise\rejection_for function instead of object init #1827

• Minor code cleanups, documentation fixes and clarifications.