Support Python 3.9

Author: huashengdun

.travis.yml

@@ -8,6 +8,7 @@ python:
   - "3.6"
   - "3.7"
   - "3.8"
+  - "3.9"
 
 install:
   - pip install -r requirements.txt

requirements.txt

@@ -1,3 +1,3 @@
-paramiko==2.7.2
+paramiko==2.10.4
 tornado==5.1.1; python_version < '3.5'
-tornado==6.0.4; python_version >= '3.5'
+tornado==6.1.0; python_version >= '3.5'

setup.py

@@ -32,6 +32,7 @@
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
     ],
     install_requires=[
         'tornado>=4.5.0',