updated README.md -Versions section added

Author: Bernd Kiefer

README.md

@@ -1,4 +1,13 @@
-# Introduction
+# helm-elasticstack
+
+## Versions
+
+| helm chart version | elastic stack version |
+|--------------------|-----------------------|
+| v1.1.0             | 6.4.3                 |
+| v1.0.0             | 6.2.4                 |
+
+## Introduction
 
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