update compatibility table in readme

Author: pr7prashant

README.md

@@ -117,11 +117,13 @@ release, we will increment the minor version whenever we update the minor Kubern
 
 Generally speaking newer clients will work with older Kubernetes, but compatability isn't 100% guaranteed.
 
-| client version | older versions | 1.18 | 1.19 | 1.20 |
-|----------------|----------------|------|------|------|
-|  0.12.x        |       -        |  ✓   |  x   |  x   |
-|  0.13.x        |       -        |  +   |  ✓   |  x   |
-|  0.14.x        |       -        |  +   |  +   |  ✓   |
+| client version | older versions | 1.18 | 1.19 | 1.20 | 1.21 | 1.22 |
+|----------------|----------------|------|------|------|------|------|
+|  0.12.x        |       -        |  ✓   |  x   |  x   |  x   |  x   |
+|  0.13.x        |       -        |  +   |  ✓   |  x   |  x   |  x   |
+|  0.14.x        |       -        |  +   |  +   |  ✓   |  x   |  x   |
+|  0.15.x        |       -        |  +   |  +   |  +   |  ✓   |  x   |
+|  0.16.x        |       -        |  +   |  +   |  +   |  +   |  ✓   |
 
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