Publish pip package from travis

[kkazmierczyk]

Once #37 is done, to avoid repetitive manual deployment, we can automate publishing pipy package and github one by using travis.

The solution is described on https://docs.travis-ci.com/user/deployment-v2/

Current steps to publish:
git tag 2.0 # Create tag
git push --tags # Push tag (you can do it from Pycharm)
python3 -m build # Build pip package with version from tag
python3 -m twine upload --repository testpypi dist/* # Send to test pip repository
pip install --extra-index-url https://test.pypi.org/simple/ javacore-analyser --upgrade # Test if you can run the tool
javacore_analyser_batch ~/Documents/waitdata/waitData2.zip /tmp/waitreport # Smoke test of new version

python3 -m twine upload dist/* # Send to production pip repository

Navigate to
https://github.com/IBM/javacore-analyser/tags
click on Create release
Select previous tag and click on "Generate release notes"
Attach the files from dist directory (whl package and tar.gz)
Click to Submit

[kkazmierczyk]

Currently it is blocked by #12

[kkazmierczyk]

Note: travis does not support toml file which we are using: travis-ci/dpl#822. Will have to make publish manually from https://packaging.python.org/en/latest/tutorials/packaging-projects/:
python3 -m twine upload --repository testpypi dist/*