Add compatibility info

TomGijselinck · TomGijselinck · commit 54dba0ce8180 · 2020-06-03T19:47:13.000+02:00
diff --git a/README.md b/README.md
@@ -25,3 +25,9 @@ if __name__ == "__main__":
 ```sh
 $ pip install git+https://github.com/elimity-com/insights-client-python.git
 ```
+
+## Compatibility
+
+| Client version | Insights version |
+| -------------- | ---------------- |
+| 1              | ^2.7             |
