v1.1.1: Make Postnl::call method public to be able to call methods without wr…

Fixes #36

v1.1.0

New Features:

• Implement ArrayAccess (#34)
• Added IBANcheck to readme (#35)

v1.0.2: Merge pull request #33 from DivideBV/fix/generate-label-response

• Update location client (#30)
• Fix problem with Postnl::generateLabel() (#33)