updating changelog

CHANGELOG.md

@@ -3,6 +3,35 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/)
 
+## [2.1.0](https://github.com/esl/amoc/compare/2.0.1...2.1.0) - 2020-08-19
+
+This release focuses on the REST API, which is now powered by OpenAPI Specifications generated by [openapi-generator](https://openapi-generator.tech/).
+
+## The main changes:
+
+* [PR#123](https://github.com/esl/amoc/pull/123) - simplification of scenario uploading, now it can be done using the following command: `curl -s -H "Content-Type: text/plain" -T scenario.erl 'http://localhost:4000/upload'`
+* [PR#124](https://github.com/esl/amoc/pull/124) - switch from [cowboy-swagger](https://github.com/inaka/cowboy_swagger) to [amoc_rest](https://github.com/esl/amoc_rest) (framework generated using [openapi-generator](https://openapi-generator.tech/)). Online Swagger UI documentation for the current release can be found [here](https://esl.github.io/amoc_rest/?v=1.1.0).
+* [PR#125](https://github.com/esl/amoc/pull/125) - possibility to update scenario settings at runtime. Support of the settings for helper modules. Update of the `-required_variable(...)` module attribute format:
+```
+-type module_attribute() :: #{name := name(),
+                              description := string(),
+                              default_value => value(),
+                              verification => verification_method(),
+                              update => update_method()}.
+```
+* [PR#130](https://github.com/esl/amoc/pull/130) - added new `/scenarios/info/{scenario_name}` REST API, it returns edoc description of the scenario module and all the relevant settings declared using `-required_variable(...)` attribute.
+* [PR#131](https://github.com/esl/amoc/pull/131) - implementation of the `/execution/*` REST APIs:
+    * `/execution/start` - starts scenario on all the nodes in the cluster
+    * `/execution/stop` - stops scenario execution on all the nodes in the cluster
+    * `/execution/add_users` - adds new users on all or specific nodes in the cluster
+    * `/execution/remove_users` - removes users on all or specific nodes in the cluster
+    * `/execution/update_settings` - updates scenario settings on all or specific nodes in the cluster
+* [PR#132](https://github.com/esl/amoc/pull/132) - remove the legacy way of providing configuration through erlang app environment variables
+* [PR#133](https://github.com/esl/amoc/pull/133) - significant improvement of the `/status` REST API, introduction of the `/status/{node_name}` REST API (which can be used to check the status of other nodes in the cluster). The following thing are reported:
+    * Amoc application status (up/down)
+    * Amoc specific env. variables
+    * Amoc controller status + runtime scenario settings for running/terminating/finished states
+
 ## [2.0.1](https://github.com/esl/amoc/compare/2.0.0...2.0.1) - 2019-12-05
 
 ### Changed: