Can't install because old dependency guzzlehttp 5.x

[spacie2136]

Can you please update the Guzzlehttp version to 6^ ? On my system:

google/apiclient v2.2.2 requires guzzlehttp/guzzle (~5.3.1|~6.0)
google/auth v1.3.3 requires guzzlehttp/guzzle (~5.3.1|~6.0)
rapidwebltd/php-google-oauth-2-handler v1.2.2 requires guzzlehttp/guzzle (^6.3)

Error installing:

Problem 1

• Installation request for coinbase/coinbase-commerce ^1.0 -> satisfiable by coinbase/coinbase-commerce[v1.0.0].
• Conclusion: remove guzzlehttp/guzzle 6.3.3
• Conclusion: don't install guzzlehttp/guzzle 6.3.3
• coinbase/coinbase-commerce v1.0.0 requires guzzlehttp/guzzle ^5.0 -> satisfiable by guzzlehttp/guzzle[5.0.0, 5.0.1, 5.0.2, 5.0.3, 5.1.0, 5.2.0, 5.3.0, 5.3.1, 5.3.2, 5.3.3].
• Can only install one of: guzzlehttp/guzzle[5.3.1, 6.3.3].
• Can only install one of: guzzlehttp/guzzle[5.3.2, 6.3.3].
• Can only install one of: guzzlehttp/guzzle[5.3.3, 6.3.3].
• Can only install one of: guzzlehttp/guzzle[5.0.0, 6.3.3].
• Can only install one of: guzzlehttp/guzzle[5.0.1, 6.3.3].
• Can only install one of: guzzlehttp/guzzle[5.0.2, 6.3.3].
• Can only install one of: guzzlehttp/guzzle[5.0.3, 6.3.3].
• Can only install one of: guzzlehttp/guzzle[5.1.0, 6.3.3].
• Can only install one of: guzzlehttp/guzzle[5.2.0, 6.3.3].
• Can only install one of: guzzlehttp/guzzle[5.3.0, 6.3.3].
• Installation request for guzzlehttp/guzzle (locked at 6.3.3) -> satisfiable by guzzlehttp/guzzle[6.3.3].

[asiop]

Same here

[spacie2136]

Same here

I just forked this repo and fixed dependency.

[guacamoli]

@spacie2136 @asiop, updated the guzzlehttp version.