fix a few filter->aggregations

Author: Phil Varner

.github/pull_request_template.md

@@ -10,4 +10,4 @@
 **PR Checklist:**
 
 - [ ] This PR has **no** breaking changes.
-- [ ] I have added my changes to the [CHANGELOG](https://github.com/stac-api-extensions/filter/blob/main/CHANGELOG.md) **or** a CHANGELOG entry is not required.
+- [ ] I have added my changes to the [CHANGELOG](https://github.com/stac-api-extensions/aggregations/blob/main/CHANGELOG.md) **or** a CHANGELOG entry is not required.

CHANGELOG.md

@@ -13,5 +13,5 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Many changes
 
-[Unreleased]: <https://github.com/stac-api-extensions/filter/compare/v0.2.0..main>
-[v0.2.0]: <https://github.com/radiantearth/stac-api-spec/tree/v0.2.0>
+[Unreleased]: <https://github.com/stac-api-extensions/aggregation/compare/v0.2.0..main>
+[v0.2.0]: <https://github.com/stac-api-extensions/aggregation/tree/v0.2.0>