Add new version change list
DOCS: enums for placeOrders method
FEAT: added placedOrders income params classes
REFACTOR: extract ListBase and SingleBase for Parsers
REFACTOR: integration specs
ref #17
FEAT: completed placeOrders method
Merge remote-tracking branch 'origin/placing-order'

* origin/placing-order:
  FEAT: completed placeOrders method
  REFACTOR: integration specs ref #17
  REFACTOR: extract ListBase and SingleBase for Parsers
  FEAT: added placedOrders income params classes
  DOCS: enums for placeOrders method
  Add new version change list