v3.5.0

• Add h3_get_faces binding
• ⚠️ Replace h3_hex_area_m2 and h3_hex_area_km2 with h3_hex_area
• ⚠️ Replace h3_edge_length_m and h3_edge_length_km with h3_edge_length
• ⚠️ Remove hex_range, hex_ranges and hex_range_distances
• Remove h3 core library version check, since we know which version we are linking
• Fix PostgreSQL 12 build (see #4, thanks @Komzpa)
• Update h3 core library to v3.5.0