Updating TF version on current snapshot

Author: karllessard

README.md

@@ -148,7 +148,7 @@ This table shows the mapping between different version of TensorFlow for Java an
 | 0.3.1  | 2.4.1  |
 | 0.3.2  | 2.4.1  |
 | 0.3.3  | 2.4.1  |
-| 0.4.0-SNAPSHOT | 2.5.0
+| 0.4.0-SNAPSHOT | 2.6.0
 
 ## How to Contribute?