Update python version on travis.

cotes2020 · cotes2020 · commit a8490f5fbe23 · 2020-02-26T03:13:09.000+08:00
https://docs.travis-ci.com/user/reference/bionic/#python-support
diff --git a/.travis.yml b/.travis.yml
@@ -5,7 +5,7 @@ language: ruby
 rvm: 2.6.5
 
 before_install:
-  - pyenv global 3.7.5
+  - pyenv global 3.7.6
 
 install:
   - pip install -r _scripts/py/requirements.txt
