Bumping dependency versions

Updating guzzlehttp/guzzle to ^6.5|^7.8 and omnipay/common to ^3.0

#9

Adds context support to ErrorEvent

Updates ErrorEvent constructor

Give access to subscriber class instance properties

Merge pull request #6 from vimeo/update-visibility-of-class-properies

Make class instance props protected

Event cleanup

Merge pull request #4 from vimeo/event-cleanup

Event cleanup

Composer dependecy fix

Updates psr/log from 1.0.0 to ^1.0

Initial release

Initial release