Keep CITATION details up to date

- Bumped version number
- Updated affiliation for Thomas and Kristian, reflecting recent change
  in agency name

Bump PROJ-data version in metadata.sql

Create tag 9.4.0

Create tag 9.3.1

Create tag 9.3.0

Create tag 9.2.1

Create tag 9.2.0

Create tag 9.1.1

Create tag 9.1.0

Create tag 9.0.1