repository(doc): improved changelog…

…akin to 'Keep a changelog'.

git-repository/CHANGELOG.md

@@ -1,21 +1,30 @@
-### v0.10.0 (2021-??-??)
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## Unreleased
+
+### Breaking
 
 - Change return value of `prelude::RepositoryAccessExt::committer()` from `git_actor::Signature` to `Result<git_actor::Signature, easy::borrow:repo::Error>`
 - Change return value of `prelude::ReferenceAccessExt` from `Result<Vec<RefEdit>>, _>` to `Result<easy::Reference, _>`.
 - Rename `State` structs that serve as platform for iterators or other dependent types into `Platform`. These are usually intermediate objects only.
 - Rename `easy::Reference::log()` into `easy::Reference::logs()`
 
-### v0.9.1 (2021-09-10)
+## v0.9.1 (2021-09-10)
 
 - Remove `max-performance` feature from default set until the `msvc` build issue is fixed. Otherwise it will surprisingly break windows builds.
 
-### v0.9.0 (2021-09-08)
+## v0.9.0 (2021-09-08)
 
 - rename `prelude::ConfigAccessExt` to `prelude::RepositoryAccessExt`
 - `prelude::ObjectAccessExt::commit()` signature change
 - cargo feature changed in incompatible ways. `network` was replaced by more finegrained options for _blocking_ and _async_ networking, as well as optional http transport
 - 
-#### New
+### New
 
 - `init()`
 - `init_bare()`
@@ -26,16 +35,16 @@
 - `easy::ext::ReferenceAccessExt::head()`
 - `ext::ReferenceExt` trait
 
-#### Breaking
+### Breaking
 - **renames / moves / Signature Changes**
     - `path::Path` to `Path`
     - `init::repository(dir)` -> `path::create::into(dir, **Kind**)`
 
-### v0.8.1 (2021-08-28)
+## v0.8.1 (2021-08-28)
 
 - Introduce `EasyArcExclusive` type, now available thanks to `parking_lot` 0.11.2
 
-### v0.8.0 (2021-08-27)
+## v0.8.0 (2021-08-27)
 
 - Rename `object` to `objs` to be equivalent to `refs` and make space for the new `object` module
 - various minor version updates of pre-release dependencies