Update readme [ci skip]
:lipstick: [style] Fewer parens, whitespace
Less ::, whitespace
Improve tests
Require a type for spatial columns

* Less ::
Return type and klass based on geographic/geometric
Inspect spatial column types

o.type may be point, etc
Cleanup #add_spatial_column

* Fix srid
* Add geo_type helper
* Remove usage of AddGeometryColumn SQL function
* Force type to point when type is geography to avoid invalid
“Geography(geography)” types
Remove limit test

* This syntax appears invalid and is undocumented.
Remove unnecessary overrides

* add_column, remove_column
Remove dead code