Creating a new release (GitHub and PyPi)

1. Ensure you are on master: git checkout master
2. Make sure there are no staged changes.
3. Ensure tests are passing (local and Travis CI): py.test
4. Increment __version__ in las.py
5. Find changes since last version release
6. Summarise these changes in CHANGELOG.md
7. Commit with a message e.g. v1.3
8. Tag with the same message e.g. git tag v1.3
9. Push to github - first the commit: git push github master
10. ..and then push the new tag: git push github tag v1.3
11. Create a universal wheel: python setup.py bdist_wheel --universal
12. This will put a new wheel file in dist/
13. Upload to PyPI with: twine upload -u USERNAME -p PASSWORD dist/blah_vmajor.minor.wheel
14. Create a new GitHub release - https://github.com/kinverarity1/lasio/releases/new - select the tag, and copy the CHANGELOG text in.
15. Copy the wheel file into the release page.
16. Publish the release.

That's it.