update CHANGELOG

Author: matthewhanson

CHANGELOG.md

@@ -10,12 +10,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
-- `processing:lineage` now allows CommonMark for rich-text representation ([#950](https://github.com/radiantearth/stac-spec/issues/950))
-
 ### Deprecated
 
 ### Removed
 
 ### Fixed
 
+## [v1.0.0] - 2021-03-08
+
+Initial independent release, see [previous history](https://github.com/radiantearth/stac-spec/commits/4a841605ad83a16f45fcb88ed90117d6c77a7f04/extensions/processing)
+
+### Changed
+
+- `processing:lineage` now allows CommonMark for rich-text representation ([#950](https://github.com/radiantearth/stac-spec/issues/950))
+
+
 [Unreleased]: <https://github.com/stac-extensions/processing/compare/v1.0.0...HEAD>
+[v1.0.0]: <https://github.com/stac-extensions/processing/tree/v1.0.0>]

README.md

@@ -6,7 +6,6 @@
 - **Scope:** Item, Collection
 - **Extension [Maturity Classification](https://github.com/radiantearth/stac-spec/tree/master/extensions/README.md#extension-maturity):** Proposal
 - **Owner**: @emmanuelmathot
-- **History**: [Prior to March 2nd 2021](https://github.com/radiantearth/stac-spec/commits/4a841605ad83a16f45fcb88ed90117d6c77a7f04/extensions/processing)
 
 Processing metadata is considered to be data that indicate from which processing chain a data originates and how the data itself has been produced.
 Overall, it helps to increase traceability and search among processing levels and multiple algorithm versions.