v6.0.0-beta.3

Features

• add consignmentClass property/const to carrier classes (95c551d)
• add more ways to get allowed options for a consignment (#331) (59f2ab5)
• add webhook webservices (ee900ef)
• set external identifier in consignments to allow easier retrieval of rjp barcodes (9d4276e)

Bug Fixes

• bugfixes for RJP (#332) (2e53967)
• improve carrier configurations (d88f3e1)
• make arrayWithoutNull function work correctly (#330) (a59445d)
• remove signature from redjepakketje (b5f84c0)
• restructure AbstractCarrier (f7efa64)