Fix links and formatting in CHANGELOG

CHANGELOG.md

@@ -3,8 +3,12 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog][Keep a Changelog] and this project adheres to [Semantic Versioning][Semantic Versioning].
 
+---
 ## [Unreleased]
 
+---
+## [Released]
+
 ## [v0.2.0] - 2021-03-29
 ### Changed
 - Renamed `RSAKeySizeBytes` to `rsaKeySizeBits`, which fixes the mismatch
@@ -21,21 +25,15 @@ The format is based on [Keep a Changelog][Keep a Changelog] and this project adh
 - Added `DatastoreGetBandwidth()` and `DatastoreResetBandwidth()` functions to
   help students write tests for the `AppendFile()` efficiency requirement.
 
----
-
-## [Released]
-
 ## [v0.1.0] - 2021-02-21
 CHANGELOG did not exist in this release.
 
----
-
 <!-- Links -->
 [Keep a Changelog]: https://keepachangelog.com/
 [Semantic Versioning]: https://semver.org/
 
 <!-- Versions -->
-[Unreleased]: https://github.com/cs161-staff/project2-userlib/releases/v0.2.0...HEAD
+[Unreleased]: https://github.com/cs161-staff/project2-userlib/compare/v0.2.0...HEAD
 [Released]: https://github.com/cs161-staff/project2-userlib/releases
-[v0.2.0]: https://github.com/cs161-staff/project2-userlib/releases/v0.1.0...v0.2.0
+[v0.2.0]: https://github.com/cs161-staff/project2-userlib/compare/v0.1.0...v0.2.0
 [v0.1.0]: https://github.com/cs161-staff/project2-userlib/releases/v0.1.0