Version 2.2.0

New functionality

• Query relation members based on role (Features.with_role()) (#74)

• Mercator-aware measurement functions: area(), distance(), length() (#1, #15)

• Mercator-aware buffer() (#9)

• Features.revision returns the revision number of the tileset

Bug fixes

• to_mercator() / from_mercator() now properly update the Geometry's envelope

• to_mercator() now rejects odd number of coordinate value

• Coordinate: fixed hashing to match tuple's

• Feature: fixed ID comparison

• Formatter: Fixed memory leak