Using tags misses all ELTS releases, which are relevant for ELTS-only release cycles.
Important changes:
- very old v3 and v4 releases completely dropped except for 3.3.0, and 3.5.0.
- We track only as far back as v7, so dropping v4 and earlier should be fine.
- 7.0.1 and 9.3.2 are missing, which is okay because both are superseded.
Fixes#92.
