Bump insights version to 2.8 (for graph timestamps)

TomGijselinck · TomGijselinck · commit 4b5f200e17f7 · 2020-06-04T08:52:43.000+02:00
diff --git a/README.md b/README.md
@@ -30,4 +30,4 @@ $ pip install git+https://github.com/elimity-com/insights-client-python.git
 
 | Client version | Insights version |
 | -------------- | ---------------- |
-| 1              | ^2.7             |
+| 1              | ^2.8             |
