Making a release

To make a new release of green-kernels, follow the following steps:

If you are yet to make a release on your current computer, run cargo login and copy an API key from https://crates.io/me
Checkout the main branch and git pull, then checkout a new branch called release-v[x].[y].[z] (where [x], [y], and [z] are defined in the next step):
```
git checkout main
git pull
git checkout -b release-v[x].[y].[z]
```
Update the version number in Cargo.toml. The version numbers have the format [x].[y].[z]. If you are releasing a major version, you should increment [x] and set [y] and [z] to 0. If you are releasing a minor version, you should increment [y] and set [z] to zero. If you are releasing a bugfix, you should increment [z].
Commit your changes and push to GitHub, open a pull request to merge changes back into main, and merge the pull request.
Create a release on GitHub from the release branch. The release tag and title should be v[x].[y].[z] (where [x], [y] and [z] are as in step 2). In the "Describe this release" box, you should bullet point the main changes since the last release.
Run cargo publish --dry-run, then run cargo package --list and check that no unwanted extras have been included in the release.
If everything is working as expected, run cargo publish. This will push the new version to crates.io. Note: this cannot be undone, but you can use cargo yank to mark a version as unsuitable for use.
Open a pull request to main to update the version number in Cargo.toml to [x].[y].[z]-dev

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