fix license file to conform to MIT rules, add License section to README (#645)

* fix license file to conform to MIT rules, add License section to README

* Update README.md

Co-authored-by: Pete Gadomski <[email protected]>

---------

Co-authored-by: Pete Gadomski <[email protected]>

Author: Phil Varner

LICENSE

@@ -1,11 +1,5 @@
-Copyright for portions of stac-server are held by Development Seed (2006) as
-part of project sat-api (https://github.com/sat-utils/sat-api). All other 
-copyright for stac-server are held by Element 84, Inc (2020).
-
-Original license below, from https://github.com/sat-utils/sat-api/LICENSE
-------
-
 Copyright (c) 2016 Development Seed
+Copyright (c) 2020 Element 84, Inc
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -56,6 +56,7 @@
     - [Running System and Integration Tests](#running-system-and-integration-tests)
     - [Updating the OpenAPI specification](#updating-the-openapi-specification)
   - [About](#about)
+  - [License](#license)
 
 ## Overview
 
@@ -1261,3 +1262,10 @@ and fix any errors or warnings.
 ## About
 
 [stac-server](https://github.com/stac-utils/stac-server) was forked from [sat-api](https://github.com/sat-utils/sat-api). Stac-server is for STAC versions 0.9.0+, while sat-api exists for versions of STAC prior to 0.9.0.
+
+## License
+
+stac-server is licensed under [The MIT License](https://opensource.org/license/mit/).
+Copyright for portions of stac-server is held by Development Seed (2016) as
+part of project [sat-api](https://github.com/sat-utils/sat-api)
+[original license](https://github.com/sat-utils/sat-api/blob/master/LICENSE). Copyright for all changes to stac-server since the fork date is held by Element 84, Inc (2020).