2.0.0

Added

• Introduce partial inputs for update mutations

Fixed

• Getter with argument with default values can be called without any values
• Upgrade graphql-php to 0.11

BREAKING CHANGE

• Expose entities default values. The breaking change is not in PHP code, but in the API.
  Some fields will be changed from mandatory to optional with default value. It should
  not break existing API clients, but it may or may not have side-effects on API clients.