Bump guzzlehttp/psr7 from 1.6.1 to 1.7.0

[dependabot-preview[bot]]

Bumps guzzlehttp/psr7 from 1.6.1 to 1.7.0.

Release notes

Sourced from guzzlehttp/psr7's releases.

1.7.0

See change log for changes.

Changelog

Sourced from guzzlehttp/psr7's changelog.

[1.7.0] - 2020-09-30

Added

• Replaced functions by static methods

Fixed

• Converting a non-seekable stream to a string
• Handle multiple Set-Cookie correctly
• Ignore array keys in header values when merging
• Allow multibyte characters to be parsed in Message:bodySummary()

Changed

• Restored partial HHVM 3 support

Commits

• 53330f4 Prepare for 1.7.0 release (#353)
• b2007a5 Merge pull request #350 from GrahamCampbell/php8
• f1240c7 Run tests on PHP 8.0
• ba0f9e2 Extracted functions to static methods (#345)
• 0cddfcb CI and HHVM fixes (#347)
• 188cc82 minor phpdoc fixes
• 51ee3db Merge pull request #335 from guzzle/fix-test-on-windows
• a0288ac somes simple fixes backported from 2.x
• df48a50 fix tests on windows
• c247bf8 add some gitignore from master which helps when you switch branches
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

A newer version of guzzlehttp/psr7 exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.