warn if not on stac api 1.0.0 (#347)

* warn if not on stac api 1.0.0

Author: Phil Varner

CHANGELOG.md

@@ -5,6 +5,12 @@ 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).
 
+## [0.6.1] - 2023-04-24
+
+### Changed
+
+- Changed version upgrade warning to 1.0.0
+
 ## [0.6.0] - 2023-04-23
 
 ### Added