Versioning

[james-answer]

Update specification with versioning details

We should also update the interaction ID's when we go to a single spec version with the major version 1.

[james-answer]

I have created a branch with an updated versioning page as per discussions at the TA meeting.

https://github.com/nhsconnect/gpconnect/tree/feature/versioning

[james-answer]

relevant to https://github.com/nhsconnect/gpconnect/issues/293 endpoint changes.

[james-answer]

This is now covered by the individual issues for the different part of the versioning updates so I am going to close this issue as a duplicate.