Now that Guzzle7 is out use the guzzle7 adapter

[swilla]

I was getting errors trying to install this package with the Guzzle6 adapter, I was able to get everything working bu upgrading to Laravel 8 (and Guzzle 7).

This PR just bumps the guzzle adapter to 7.

I was able to successfully get this working on a Laravel 8 package using the following command:

composer require jdecool/clockify-api php-http/guzzle7-adapter

[jdecool]

Thanks @swilla

This PR make me realize that we should not constraint any guzzle version in the Composer.
I use php-http/httplug to be independant of any http client library. If we need to bump Guzzle because your application use a specific version, it's a mistake.

So I suggest to simply remove the guzzle dependency in the composer.json and let the user and the application tell which client to use.

[swilla]

@jdecool I removed the guzzle constraint. For the record, it is still working in my application. I have also updated the readme.

[jdecool]

Now I remember why I've had guzzle, it's because a client is required for testing and install the library on your development machine.

I think we could php-http/mock-client which is designed for testing and tests will be green.

[jdecool]

Nice.

Thanks @swilla

[jdecool]

I just tag a new release with this PR.

See https://github.com/jdecool/clockify-api/releases/tag/0.2.0