Specify python version

colin4124 · colin4124 · commit 80a283321162 · 2022-02-24T13:19:50.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,7 @@
 name: Mill Cache Package CI
 language: python
+python:
+  - "3.9"
 script:
   - make prepare
   - python setup.py bdist_wheel
