v0.9.0

• #97 Make entities extendable (@tautelis, @pamil)
• #124 Make invoices and credit memo grid consistent (@bartoszpietrzak1994)
• #125 Passing invoice entity to invoice pdf file generator (@bartoszpietrzak1994)
• #126 added invoice screenshot (@doctorx32)
• #132 Customizations friendly improvements (@bartoszpietrzak1994)
• #133 Enhanced conflict section (@bartoszpietrzak1994)
• #134 Representative added to invoice shop billing data (@bartoszpietrzak1994)
• #135 Fixed typo in service definition (@kortwotze, @GSadee)
• #136 Minimise conflicts and require Messenger 4.3 (@pamil)
• #137 Require Symfony ^4.2 and improve autoloading (@pamil)
• #138 Allow to run PHPUnit without arguments and run Behat with strict mode on Travis CI (@pamil)
• #139 Add missing migration (@pamil, @GSadee)
• #140 Hotfix for TestOrderPlacedProducer (@pamil)
• #141 A new way to test generating previous invoices (@pamil)
• #146 [Admin] Unify order link in InvocingPlugin (@Tomanhez)
• #148 Fix GenerateInvoicesCommand selects order without number (@tom10271)
• #158 Update dependencies (@pamil)
• #160 Add migrations for tests app (@Tomanhez)
• #162 Require GridBundle v1.7+ with embeddables support (@pamil)