Merge pull request #210 from zhy1985555/master

update travis config

Author: zhy1985555

.travis.yml

@@ -5,6 +5,7 @@ python:
 - '3.5'
 - '3.6'
 - '3.7'
+- '3.10'
 install:
 - pip install requests
 - pip install six
@@ -13,6 +14,7 @@ install:
 - pip install dicttoxml
 - pip install crcmod
 - pip install pycryptodome
+- pip install importlib_metadata
 notifications:
   email:
     recipients: