Merge pull request #171 from keptn-contrib/patch/add-keptn087-readme

add Keptn 0.8.7 to readme

Author: Jürgen Etzlstorfer

README.md

@@ -38,7 +38,7 @@ Please always double-check the version of Keptn you are using compared to the ve
 |   0.8.0          | keptncontrib/prometheus-service:0.4.0  |
 |   0.8.1, 0.8.2   | keptncontrib/prometheus-service:0.5.0  |
 |   0.8.1 - 0.8.3  | keptncontrib/prometheus-service:0.6.0  |
-|       0.8.4      | keptncontrib/prometheus-service:0.6.1  |
+|   0.8.4 - 0.8.7  | keptncontrib/prometheus-service:0.6.1  |
 
 
 ## Setup Prometheus Monitoring