Merge branch 'release/1.1.0'
made guzzle version less strict

if a project has dependencies for an other guzzle version (in my example for 3.7.x) because of an other vendor (f.e. aws/aws-sdk-php) there are unresolvable composer conflicts
Merge pull request #1 from invit/master

made guzzle version less strict
Merge branch 'master' into dev