Geojson-to-sqlite

- Fixed a bug where a `_tmp` column remained after importing a geometry with no additional properties. [30](https://github.com/simonw/geojson-to-sqlite/issues/30)
- Added `--version` option to show the current installed version of the tool. [32](https://github.com/simonw/geojson-to-sqlite/issues/32)

- Command can now accept more than one GeoJSON file. The contents of all of the files will be inserted into the same table. [21](https://github.com/simonw/geojson-to-sqlite/issues/21)
- Using the `--spatial-index` option against the same database twice no longer triggers an error.
- Now depends on [sqlite-utils 3.23](https://sqlite-utils.datasette.io/en/stable/changelog.html#v3-23) on higher, taking advantage of the SpatiaLite utilities in that library. Thanks, [Chris Amico](https://github.com/eyeseast). [#28](https://github.com/simonw/geojson-to-sqlite/issues/28)

- Fixed bug where `--spatialite` option failed with an error if the GeoJSON features being loaded consisted of just a geometry with no properties. [30](https://github.com/simonw/geojson-to-sqlite/issues/30)

- New `--properties` option for writing GeoJSON properties to a JSON column called `properties` - or use `--properties=props` to write to a column called `props`. Thanks, [Chris Amico](https://github.com/eyeseast). [#25](https://github.com/simonw/geojson-to-sqlite/issues/25)

- Fixed bug where the `id` column did not come first in the table schema. [20](https://github.com/simonw/geojson-to-sqlite/issues/20)

- New `--nl` option for consuming newline-delimited GeoJSON - thanks, Chris Amico! [13](https://github.com/simonw/geojson-to-sqlite/issues/13)
- New `--spatial-index` option which creates the table using SpatiaLite and adds a spatial index for the geometry column. [17](https://github.com/simonw/geojson-to-sqlite/issues/17)