new_contents: 
  class ValidationError(ValueError):
      pass
  
  
  class InvalidCountryCodeError(ValidationError):
      pass
  
  
  class InvalidPlaceTypeError(ValidationError):
      pass
  
  
  class InvalidProfileError(ValidationError):
      pass
  
  
  class InvalidFeatureError(ValidationError):
      pass
  
  
  class HTTPError(ValidationError):
      pass
  
  
  class InvalidCoordError(ValidationError):
      pass
  
  
  class InputSizeError(ValidationError):
      pass
  
  
  class ImageSizeError(ValidationError):
      pass
  
  
  class TokenError(ValidationError):
      pass
  
  
  class InvalidParameterError(ValidationError):
      pass
  
  
  class InvalidFileError(ValidationError):
      pass
  
subject: add an errors.py containing all the project-specific Exception types, borrowed from mapbox-sdk-py