Merge pull request #1 from oalders/master

No need to use map in void context.
Fix incompatibilities with Business::CPI

Business::CPI version 0.909 had many breaking changes, so we update the
appropriate features.
Merge branch 'master' of github.com:andrewalker/p5-business-cpi-gateway-paypal
Add Olaf Aulders to the list of contributors
Remove receiver_email attribute
Update version
Fixes typos.