Implement migrate command

[jsignell]

Related Issue(s): Closes #319

Description: Looks like

stac migrate tests/data-files/planet-disaster/collection.json

Output

The red/green is coming from github markdown :) ```diff --- before +++ after @@ -4,6 +4,11 @@ "stac_version": "1.0.0", "description": "[Planet Disaster Data](https://www.planet.com/disasterdata/) makes imagery available directly to the public, volunteers, humanitarian organizations, and other coordinating bodies in support of the International Charter for Space and Major Disasters. Data is released for individual disaster events, providing a 30 day window pre- and post-disaster. Imagery is provided under Creative Commons licenses, free of charge, with either CC-BY-SA or CC-BY-NC.", "links": [ + { + "rel": "self", + "href": "/home/jsignell/stactools/tests/data-files/planet-disaster/collection.json", + "type": "application/json" + }, { "rel": "root", "href": "./collection.json", @@ -16,8 +21,28 @@ "title": "Hurricane Harvey" } ], - "stac_extensions": [], "title": "Planet Disaster Data", + "extent": { + "spatial": { + "bbox": [ + [ + -96, + 28, + -93, + 31 + ] + ] + }, + "temporal": { + "interval": [ + [ + "2017-08-28T18:00:00Z", + null + ] + ] + } + }, + "license": "CC-BY-SA-4.0", "keywords": [ "disaster", "open" @@ -79,26 +104,5 @@ "minimum": 0, "maximum": 24 } - }, - "extent": { - "spatial": { - "bbox": [ - [ - -96, - 28, - -93, - 31 - ] - ] - }, - "temporal": { - "interval": [ - [ - "2017-08-28T18:00:00Z", - null - ] - ] - } - }, - "license": "CC-BY-SA-4.0" + } } ```

To save the file and not show the diff:

stac migrate tests/data-files/planet-disaster/collection.json --save --hide-diff

PR checklist:

• [x] Code is formatted (run scripts/format).
• [x] Code lints properly (run scripts/lint).
• [x] Tests pass (run scripts/test).
• [x] Documentation has been updated to reflect changes, if applicable.
• [x] Changes are added to the CHANGELOG.

[jsignell]

I kind of feel that we do not need to test the migrate behavior itself in this repo since that should be well tested in pystac itself.

[jsignell]

Oh also let me know what you want the default behavior to be.