Update CHANGELOG.md

CHANGELOG.md

@@ -1,22 +1,29 @@
 # 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).
+
+- The format is based on [Keep a Changelog][changelog].
+- This project adheres to [Semantic Versioning][semver].
+- For versions before 1.0, we follow [the Pkg.jl convention][pkjjl]
+  that `0.a.b` is compatible with `0.a.c`.
+
+[changelog]: https://keepachangelog.com/en/1.0.0/
+[semver]: https://semver.org/spec/v2.0.0.html
+[pkjjl]: https://pkgdocs.julialang.org/v1/compatibility/#compat-pre-1.0
 
 ## [0.2.0] - 2021-05-28
 ### Added
-- Add sub-hourly unit commitment
-- Add `UnitCommitment.write(filename, solution)`
-- Add mathematical formulation to the documentation
+- Add sub-hourly unit commitment.
+- Add `UnitCommitment.write(filename, solution)`.
+- Add mathematical formulation to the documentation.
 
 ### Changed
-- Rename "Time (h)" parameter to "Time horizon (h)"
+- Rename "Time (h)" parameter to "Time horizon (h)".
 - Rename `UnitCommitment.get_solution` to `UnitCommitment.solution`, for better
   consistency with JuMP style.
 - Add an underscore to the name of all functions that do not appear in the
   documentation (e.g. `something` becomes `_something`) These functions are not
-  part of the public API and may change without notice, even in patch versions.
+  part of the public API and may change without notice, even in PATCH releases.
 - The function `UnitCommitment.build_model` now returns a plain JuMP model. The
   struct `UnitCommitmentModel` has been completely removed. Accessing model
   elements can now be accomplished as follows:
@@ -28,15 +35,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
     - `model.lodf` becomes `model[:lodf]`
 
 ### Fixed
-- Properly validate solutions with price-sensitive loads
+- Properly validate solutions with price-sensitive loads.
 
 ## [0.1.1] - 2020-11-16
 ### Added
-- Add OR-LIB and Tejada19 instances
-- Improve documentation
+- Add OR-LIB and Tejada19 instances.
+- Improve documentation.
 
 ## Fixed
-- Fixes to MATLAB and PGLIB-UC instances
+- Fixes to MATLAB and PGLIB-UC instances.
 
 ## [0.1.0] - 2020-11-06
-- Initial public release
+- Initial public release.