Update README.md (#48)

Author: Sophie-Xie

README.md

@@ -122,7 +122,7 @@ You could submit the entire spark application or invoke algorithms in `lib` libr
 |       2.6.0              |  2.6.0, 2.6.1  |
 |       2.6.1              |  2.6.0, 2.6.1  |
 |       2.6.2              |  2.6.0, 2.6.1  |
-|       3.0.0              |    3.0, 3.1    |
+|       3.0.0              |  3.0.x, 3.1.x  |
 |       3.0-SNAPSHOT       |     nightly    |
 
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