update maintenance guide with recent news

Author: Byron

MAINTENANCE.md

@@ -1,13 +1,20 @@
 This document explains how to perform the project's maintenance tasks.
 
+### Repository Configuration
+
+Settings can be changed here by means of a PR - depending on what it is a conversation about pro's and cons might be needed.
+
+https://github.com/rust-lang/team/blob/master/repos/rust-lang/flate2-rs.toml
+
+
 ### Creating a new release
 
 #### Artifacts
 
 * a tag of the version number
 * a new [crate version](https://crates.io/crates/flate2/versions)
 
-#### Process
+#### Process: Plain `cargo publish`
 
 To generate all the artifacts above, one proceeds as follows:
 
@@ -19,3 +26,20 @@ To generate all the artifacts above, one proceeds as follows:
 6. `git push --tags` to push the new tag.
 7. Go to the newly created release page on GitHub and edit it by pressing the "Generate Release Notes" and the `@` button. Save the release.
 
+#### Alternative Process: `cargo smart-release`
+
+This also maintains the `changelog.md` file, and it's able to pick up previous `cargo publish` releases and thus mixes well.
+However, it's quite new and needs some polishing.
+
+To just update the changelog, run `cargo changelog --write`.
+
+To create a new release, do as follows:
+
+1. `git checkout -b release-<next-version>` - move to a branch to prepare making changes to the repository. *Changes cannot be made to `main` as it is protected.*
+2. `cargo changelog --write` to update the changelog. Edit it to your liking.
+3. Create a commit like `git commit -am "update changelog prior to release"`
+4. `cargo smart-release -e --update-crates-index` - double-check that the release version is sensible, and if not, just edit `Cargo.toml` by hand before.
+5. Tags were created, and they should be pushed, but it might be that it fails to create a GitHub release. 
+6. Create an additional release tag with the `v` removed, i.e. `git tag -s <version> v<version>`. Then `git push  --tags` by hand.
+7. Double-check the newly created release on GitHub is populated - if not, generate the changelog manually.
+