Update CHANGELOG headers and diff links

Author: lossyrob

CHANGELOG.md

@@ -1,14 +1,14 @@
 # Changelog
 
-## unreleased
+## [Unreleased]
 
 ### Added
 
 ### Changed
 
 ### Remove
 
-## 1.0.0-beta.1
+## [1.0.0-beta.1]
 
 ### Added
 
@@ -295,19 +295,19 @@ use `Band.create`
 
 Initial release.
 
-[Unreleased]: <https://github.com/stac-utils/pystac/compare/v1.0.0-beta.1...main>
-[v1.0.0-beta.1]: <https://github.com/stac-utils/pystac/compare/v0.5.6...v1.0.0-beta.1>
+[Unreleased]: <https://github.com/stac-utils/pystac/compare/v1.0.0-beta.1..main>
+[v1.0.0-beta.1]: <https://github.com/stac-utils/pystac/compare/v0.5.6..v1.0.0-beta.1>
 [v0.5.6]: <https://github.com/stac-utils/pystac/compare/v0.5.5..v0.5.6>
 [v0.5.5]: <https://github.com/stac-utils/pystac/compare/v0.5.4..v0.5.5>
 [v0.5.4]: <https://github.com/stac-utils/pystac/compare/v0.5.3..v0.5.4>
-[v0.5.3]: <https://github.com/stac-utils/pystac/compare/v0.5.2...v0.5.3>
-[v0.5.2]: <https://github.com/stac-utils/pystac/compare/v0.5.1...v0.5.2>
-[v0.5.1]: <https://github.com/stac-utils/pystac/compare/v0.5.0...v0.5.1>
-[v0.5.0]: <https://github.com/stac-utils/pystac/compare/v0.4.0...v0.5.0>
-[v0.4.0]: <https://github.com/stac-utils/pystac/compare/v0.3.4...v0.4.0>
-[v0.3.4]: <https://github.com/stac-utils/pystac/compare/v0.3.3...v0.3.4>
-[v0.3.3]: <https://github.com/stac-utils/pystac/compare/v0.3.2...v0.3.3>
-[v0.3.2]: <https://github.com/stac-utils/pystac/compare/v0.3.1...v0.3.2>
-[v0.3.1]: <https://github.com/stac-utils/pystac/compare/v0.3.0...v0.3.1>
+[v0.5.3]: <https://github.com/stac-utils/pystac/compare/v0.5.2..v0.5.3>
+[v0.5.2]: <https://github.com/stac-utils/pystac/compare/v0.5.1..v0.5.2>
+[v0.5.1]: <https://github.com/stac-utils/pystac/compare/v0.5.0..v0.5.1>
+[v0.5.0]: <https://github.com/stac-utils/pystac/compare/v0.4.0..v0.5.0>
+[v0.4.0]: <https://github.com/stac-utils/pystac/compare/v0.3.4..v0.4.0>
+[v0.3.4]: <https://github.com/stac-utils/pystac/compare/v0.3.3..v0.3.4>
+[v0.3.3]: <https://github.com/stac-utils/pystac/compare/v0.3.2..v0.3.3>
+[v0.3.2]: <https://github.com/stac-utils/pystac/compare/v0.3.1..v0.3.2>
+[v0.3.1]: <https://github.com/stac-utils/pystac/compare/v0.3.0..v0.3.1>
 [v0.3.0]: <https://github.com/stac-utils/pystac/tree/v0.3.0>