Bumps [guzzlehttp/guzzle](https://github.com/guzzle/guzzle) from 5.3.3 to 5.3.4.
- [Release notes](https://github.com/guzzle/guzzle/releases)
- [Changelog](https://github.com/guzzle/guzzle/blob/5.3.4/CHANGELOG.md)
- [Commits](https://github.com/guzzle/guzzle/compare/5.3.3...5.3.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

• Commit 7679c8f
• #42: Bump guzzlehttp/guzzle from 5.3.3 to 5.3.4
• Branch master

dependabot[bot]