Make require guzzlehttp/guzzle to 7.01 or above

[careerhub-source]

I have install the package in my project and failed due to conflict of require guzzlehttp/guzzle, any one help me to install the package

`Your requirements could not be resolved to an installable set of packages.

Problem 1
- jobapis/jobs-common[2.0.0-beta, ..., 2.1.2] require guzzlehttp/guzzle ~6.0 -> found guzzlehttp/guzzle[6.0.0, ..., 6.5.x-dev] but it conflicts with your root composer.json require (^7.0.1).
- jobapis/jobs-careerjet 0.1.0 requires jobapis/jobs-common ^2.0.0 -> satisfiable by jobapis/jobs-common[2.0.0-beta, ..., 2.1.2].
- Root composer.json requires jobapis/jobs-careerjet ^0.1.0 -> satisfiable by jobapis/jobs-careerjet[0.1.0].`

[karllhughes]

Looks like another package in your compose file needs Guzzle 7, but this library requires Guzzle 6.

So, we'd need to upgrade this package to work with Guzzle 7. I am not actively working on this project anymore, but if you submit a PR, I'll review.

[careerhub-source]

Thank you for replay, How can submit that PR, since I try to find various method to solve that problem but still existing. Anyone help me the upgrade to Guzzle 7