Update README.md

Author: jlucansky

README.md

@@ -6,6 +6,11 @@ Each part listed below is fully covered according to https://docs.camunda.org/ma
 - [x] [Deployment](https://docs.camunda.org/manual/7.6/reference/rest/deployment/)
 - [x] [Execution](https://docs.camunda.org/manual/7.6/reference/rest/execution/)
 - [x] [External Task](https://docs.camunda.org/manual/7.6/reference/rest/external-task/)
+- [x] [History / Activity Instance](https://docs.camunda.org/manual/7.6/reference/rest/history/activity-instance/)
+- [x] [History / Incident](https://docs.camunda.org/manual/7.6/reference/rest/history/incident/)
+- [x] [History / Job Log](https://docs.camunda.org/manual/7.6/reference/rest/history/job-log/)
+- [x] [History / Process Instance](https://docs.camunda.org/manual/7.6/reference/rest/history/process-instance/)
+- [x] [History / Variable Instance](https://docs.camunda.org/manual/7.6/reference/rest/history/variable-instance/)
 - [x] [Incident](https://docs.camunda.org/manual/7.6/reference/rest/incident/)
 - [X] [Job](https://docs.camunda.org/manual/7.6/reference/rest/job/)
 - [x] [Job Definition](https://docs.camunda.org/manual/7.6/reference/rest/job-definition/)