fix: GeoPoint takes in optional precision parameter when it should be mandatory or have a default value

[leonh-ctds]

Precision parameter should actually be mandatory or have a default value specified as this results in an error if it is not specified. The GeoPoint constructor uses an encode function from geohash_tools which multiplies the precision by 5, resulting in an error as you cannot multiply a NoneType by an integer (by default, precision = None). I think there should be a more suitable default value (e.g. 2) or the parameter should not be considered optional.

Here is the error you get if you do not specify a precision parameter:
TypeError: unsupported operand type(s) for *: 'NoneType' and 'int'