Installation Error requires guzzle ^6.3 and I have 7

[dylanglockler]

The command:

composer require convertkit/convertkitapi:dev-master

Problem 1
- Root composer.json requires convertkit/convertkitapi dev-master -> satisfiable by convertkit/convertkitapi[dev-master].
- convertkit/convertkitapi dev-master requires guzzlehttp/guzzle ^6.3 -> found guzzlehttp/guzzle[6.3.0, ..., 6.5.x-dev] but it conflicts with your root composer.json require (^7.0.1).

My guzzle version from composer.json:

    "guzzlehttp/guzzle": "^7.0.1",

[dylanglockler]

Change to update composer.json with:

"guzzlehttp/guzzle": "^6.5|^7.0.1",

[mnwalker]

Better change would be below which will support future minor versions too.
"guzzlehttp/guzzle": "^6.5|^7.0",

[n7studios]

Addressing in #28, to be released as version 1.0, rather than a potentially breaking change into the unversioned dev-master. Thanks!