7.0

All versions:

• Addition of optional quantity codes #170
  This includes marking PCE quantity code as deprecated. It will be removed with the next major version.
• SEPA direct debit support #163
• Breaking change: cleanup of ID and IssuerAssignedID in reference documents #144

ZUGFeRD 2.0:

• Proper parsing of VAT amounts #164
• More conformance to ZUGFeRD 2.0 #163

ZUGFeRD 2.1/ XREchnung:

• Proper parsing of VAT amounts #164