v0.24.0

• SalesInvoice: Add marked_dubious_on, marked_uncollectible_on #205 by @roydejong

• allow guzzle 7 #206 by @it-can

• Add time_entries as default scope #207 by @robindirksen1

• Add "addNote" method to Estimate #209 by @robindirksen1

• Move notes on entities to Notable trait #210 by @robindirksen1

• PHP 5.6 minimal requirement, up from 5.5 #211