Release OCFL v1.1

[zimeon]

Issues: https://github.com/OCFL/spec/issues?q=is%3Aopen+is%3Aissue+milestone%3A1.1

To release

• [x] test zenodo release on extensions @neilsjefferies
• [x] PR for json file for zenodo plugin on spec @neilsjefferies
• [x] create press release @rosy1280
• [x] finish #598 @zimeon
• [x] PR to create past release section, update latest release section on OCFL.io, create 1.1 directory and copy spec into it, tag release @zimeon
• [x] PR for press release on news page @rosy1280
• [x] Finally, on Friday, do github release @zimeon

[zimeon]

Reopening to allow us to check off other parts as we do them

[zimeon]

v1.1 files now live:

• https://ocfl.io/1.1/spec/
• https://ocfl.io/1.1/implementation-notes/
• https://ocfl.io/1.1/spec/change-log.html

They look good from a quick check

[zimeon]

Zenodo was https://github.com/OCFL/spec/pull/616

[zimeon]

Have created 1.1 github release: https://github.com/OCFL/spec/releases/tag/1.1