add link

Author: nitram509

docs/roadmap.md

@@ -1,15 +1,18 @@
 ## Roadmap
 
+This is an overview of the roadmap.
+The project is managed on Github's [lib-bpmn-engine milestones](https://github.com/nitram509/lib-bpmn-engine/milestones) page.
+
 #### ✅ v0.1.0
 
-[progress milestone v0.1.0](///github.com/nitram509/lib-bpmn-engine/issues?q=is%3Aopen+is%3Aissue+milestone%3Av0.1.0)
+[progress milestone v0.1.0](///github.com/nitram509/lib-bpmn-engine/issues?q=is%3Aissue+milestone%3Av0.1.0+is%3Aclosed)
 
 For the first release I would like to have service tasks and events fully supported.
 
 
 #### ✅ v0.2.0
 
-[progress milestone v0.2.0](///github.com/nitram509/lib-bpmn-engine/issues?q=is%3Aopen+is%3Aissue+milestone%3Av0.2.0)
+[progress milestone v0.2.0](///github.com/nitram509/lib-bpmn-engine/issues?q=is%3Aissue+milestone%3Av0.2.0+is%3Aclosed)
 
 With basic element support, I would like to add [visualization/monitoring](./advanced-zeebe.md) capabilities.
 If the idea of using Zeebe's exporter protocol is not too complex, that would be ideal.
@@ -19,7 +22,7 @@ Also, I would like to add [expression language support](./expression-syntax.md)
 
 #### ⚙️ v0.3.0
 
-[progress milestone v0.3.0](///github.com/nitram509/lib-bpmn-engine/issues?q=is%3Aopen+is%3Aissue+milestone%3Av0.3.0)
+[progress milestone v0.3.0](///github.com/nitram509/lib-bpmn-engine/issues?q=is%3Aissue+milestone%3Av0.3.0)
 
 One last but very important feature I aim for is the ability to load & store state.
 Which means, that you as app developer would be able to persistent in-flight process instances