Merge pull request #521 from stac-utils/pv/query-extension-complete

add support for Query Extension neq, startsWith, endsWith, and contains

Author: Phil Varner

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 - Publish ingest results to a post-ingest SNS topic
 - Add datetime and bbox attributes to post-ingest SNS messages
+- Support for Query Extension operators neq, startsWith, endsWith, and contains.
 
 ### Changed