Update README.md

Author: aidlearning

README.md

@@ -116,7 +116,7 @@ Support Python2.7 and Python3.7.3:
 | AidLearning      | Python2.7    |  Python3.7.3|
 | --------- | -------- | -----: | 
 | caffe    | ✓1.0.0 | ✓ 1.0.0| 
-| mxnet     | ✓1.0.0     |   ✓1.5.0 | 
+| mxnet     | ✓1.0.0     |   ✓1.6.0 | 
 | tensorflow     | ✓1.10.0     |   ✓2.1.0 | 
 | Gluoncv     | ✗  | ✓ 0.40|
 | Keras | ✓2.2.4 | ✓2.2.4 |