Adding referrer url

Thanks so @smarek for adding referrer url information to the email templates

Removing use of deprecated functions

This removes the use of setTemplate and setLayout directly on the Email object as they are supposed to be called from the viewBuilder now.

Removing further use of deprecated functions

This release removes the use of the $this->request->here property in favor of $this->request->getAttribute('here') as the property has been deprecated as of cake 3.4.0

Fixing mistaken cakephp version require

Fixing accidentally requiring only version 3.4.0 when we really want ^3.4.0

Removing use of deprecated functions

This release fixes minor spelling errors in documentation and updates the code to stop use of functions deprecated as of cakephp 3.4.0

1.2.0

Adding emailLevels config to allow users to specify what level of errors they wish to receive emails about.

1.1.0

Beautifying html emails and fixups for documentation.

Initial release

Initial release of ErrorEmail plugin for CakePHP 3.x