This commit adds a `release` target to the Makefile, simplifying the generation
of the CHANGELOG.md (oh, this commit also adds a CHANGELOG.md). Invoke the
make target like so.
```sh
make release VTAG=v0.4.1
```
This will update the CHANGELOG with the commits included since the last
release, commit that change, and create the version tag. Then you just need
to push to github in order to publish the binary.
Lance Ball