Bump mxnet versions tested on CI

Author: leezu

env/cpu/py3-master.yml

@@ -33,7 +33,7 @@ dependencies:
     - flaky==3.6.1
     - flake8==3.7.9
     - mock<3
-    - https://repo.mxnet.io/dist/python/cpu/mxnet-1.6.0-py2.py3-none-manylinux1_x86_64.whl
+    - https://repo.mxnet.io/dist/python/cpu/mxnet-1.9.0b20201005-py2.py3-none-manylinux2014_x86_64.whl
     - scipy==1.3.2
     - regex==2020.4.4
     - nltk==3.4.5

env/cpu/py3.yml

@@ -33,7 +33,7 @@ dependencies:
     - flaky==3.6.1
     - flake8==3.7.9
     - mock<3
-    - mxnet==1.6.0
+    - mxnet==1.7.0.post1
     - scipy==1.3.2
     - regex==2020.4.4
     - nltk==3.4.5

env/gpu/py3-master.yml

@@ -33,7 +33,7 @@ dependencies:
     - flaky==3.6.1
     - flake8==3.7.9
     - mock<3
-    - https://repo.mxnet.io/dist/python/cu100/mxnet_cu100-1.7.0b20200809-py2.py3-none-manylinux2014_x86_64.whl
+    - https://repo.mxnet.io/dist/python/cu101/mxnet_cu101-1.9.0b20201005-py2.py3-none-manylinux2014_x86_64.whl
     - scipy==1.3.2
     - regex==2020.4.4
     - nltk==3.4.5

env/gpu/py3.yml

@@ -33,7 +33,7 @@ dependencies:
     - flaky==3.6.1
     - flake8==3.7.9
     - mock<3
-    - mxnet-cu101==1.6.0.post0
+    - mxnet-cu101==1.7.0
     - scipy==1.3.2
     - regex==2020.4.4
     - nltk==3.4.5