chore: Update travis python version to 3.9

ohmrefresh · ohmrefresh · commit e024d346f88d · 2024-10-01T19:32:48.000+07:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: python
 python:
-  - "3.7"
+  - "3.9"
 install: "pip install -r requirements.txt"
 script: make clean test coverage docs dist
 deploy:
