Upgrade required guzzle version

[alexvolley]

Hi, I'm getting this error when trying to require in this package because I'm using the newer version of guzzle with my Laravel application. Would it be possible to allow for newer guzzle versions?

Root composer.json requires signnow/rest-entity-manager ^1.0 -> satisfiable by signnow/rest-entity-manager[v1.0.0].
signnow/rest-entity-manager v1.0.0 requires guzzlehttp/guzzle 6.2.*|6.3.* -> found guzzlehttp/guzzle[6.2.0, ..., 6.3.3] but it conflicts with your root composer.json require (^7.0.1).

[falgonua]

Hi @alexvolley, we will check the required packages and upgrade them.

[danharrin]

Hey, is it possible to upgrade Guzzle to v7 in #2 please?

[falgonua]

@danharrin hi. We will update guzzle to 7+ in the current release b632a76