RELEASING.md

1. Do a release of schemapi if necessary

2. Update version in altair/init.py to, e.g. 1.2.0

3. Commit change and push to master

   git add altair -u
   git commit -m "MAINT: bump version to 1.2.0"
   git push origin master
   

4. Tag the release:

   git tag -a v1.2.0 -m "version 1.3.0 release"
   git push origin v1.2.0
   

5. publish to PyPI (Requires correct PyPI owner permissions)

   python setup.py sdist upload
   

6. update version in altair/init.py to, e.g. 1.3.0dev

7. Commit change and push to master

   git add altair -u
   git commit -m "MAINT: bump version to 1.3.0dev"
   git push origin master
   

8. Update recipe on conda-forge/altair-feedstock