Updated projjson schema link to 0.7 (and new link)

[cholmes]

Opening this PR more to continue the discussion in #180, since if we do want to be updating the schema versions than 1.1 release seems like a good time to.

I'm not sure what is the proper url to put in, I used https://proj.org/en/latest/schemas/v0.7/projjson.schema.json as the 'main' one seems to redirect there: https://proj.org/schemas/v0.7/projjson.schema.json But the 'id' is the latter one. There's additional discussion of this in OSGeo/PROJ#4088

The case for updating the schema is that 0.5 -> 0.7 is mostly (all?) additive, so everything in the past should work.

The case against is that we should do something different than hard code in a version number. Or if we have to since that's how schemas work then we should target a new one.

[jorisvandenbossche]

I'm not sure what is the proper url to put in, I used https://proj.org/en/latest/schemas/v0.7/projjson.schema.json as the 'main' one seems to redirect there: https://proj.org/schemas/v0.7/projjson.schema.json But the 'id' is the latter one.

Given that the GDAL documentation about PROJJSON still uses the https://proj.org/schemas/v0.7/projjson.schema.json url, I would follow their lead?

[rouault]

Given that the GDAL documentation about PROJJSON still uses the https://proj.org/schemas/v0.7/projjson.schema.json url, I would follow their lead?

yes, the redirection to the en/latest/ URL is a ReadTheDocs hosting implementation detail

[tschaub]

Should this reference in the example metadata also be changed?

geoparquet/examples/example_metadata.json

Line 32 in a684d7a

"$schema": "https://proj.org/schemas/v0.6/projjson.schema.json",