[MINOR] Update supported Spark version on README
diff --git a/README.md b/README.md
index 584a37e..2b37ea3 100644
--- a/README.md
+++ b/README.md
@@ -119,7 +119,7 @@
 
 Branch                       | Apache Spark Version
 ---------------------------- | --------------------
-[master][master]             | 2.0
+[master][master]             | 2.x.x
 [0.1.x][0.1.x]               | 1.6+
 
 Please note that for the most part, new features will mainly be added to the `master` branch.