Update information on versioning

Author: xpqz

DEVELOPMENT.md

@@ -0,0 +1,77 @@
+## Developing and publishing the Dyalog Jupyter kernel
+
+We release from the master branch, and use semantic versioning. Releases are defined by the tag name. Find the current tag by
+
+```
+git describe --tags `git rev-list --tags --max-count=1`
+```
+
+For patch releases, add 1 to the last component of the current tag. 
+
+Update the `__version__` string in `dyalog_kernel/__main__.py` accordingly, and the `version` key in `setup.py`.
+
+The patch level should reset if we're changing major or minor version components, following semver.
+
+Build release assets with
+
+```sh
+python setup.py sdist bdist_wheel
+```
+
+Built assets will end up in `dist/`, and you can instruct `pip` to install from file for testing:
+
+```sh
+pip install dist/dyalog-jupyter-kernel-x.y.z.tar.gz
+```
+
+Now tag the master branch with the new version (prefixed by `v.`):
+
+```
+git tag -a v2.0.1 -m "Release version 2.0.1"
+git push origin v2.0.1
+```
+
+Upload release assets using [twine](https://twine.readthedocs.io/en/stable/). Install `twine` with 
+
+```sh
+pip install twine
+```
+
+Pick up the API token, and set up your `$HOME/.pypirc` file like this:
+
+```
+[distutils]
+index-servers =
+  pypi
+  testpypi
+
+[pypi]
+username = __token__
+password = pypi-A...Z  # Replace with your actual PyPI API token
+
+[testpypi]
+username = __token__
+password = pypi-A...Z  # Replace with your actual TestPyPI API token
+```
+
+Use the API key(s) as password, including the `pypi-` prefix.
+
+Upload the release to the test index first, and test that:
+
+```sh
+twine upload --repository testpypi dist/*
+```
+
+To install the module from the test index, use
+
+```sh
+pip install --index-url https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple dyalog-jupyter-kernel[==2.0.1]
+python -m 'dyalog_kernel' install
+```
+The `--extra-index-url` argument is there so that `pip` can pick up any dependencies from the main index.
+
+Upload the release to the main index, and test that:
+
+```sh
+twine upload --repository pypi dist/*
+```

setup.py

@@ -2,7 +2,7 @@
 
 setup(
     name="dyalog-jupyter-kernel",
-    version="2.0.0",
+    version="2.0.1",
     author="Stefan Kruger",
     author_email="stefan@dyalog.com",
     description="Jupyter kernel for Dyalog APL",