Update travis

jedymatt · jedymatt · commit 907e1de201c9 · 2021-08-08T22:01:38.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,9 +4,12 @@ python:
     - "3.7"
     - "3.8"
     - "3.9"
-
+os:
+    - linux
+    - osx
+    - windows
 before_install:
-    - py -m pip install --upgrade pip
+    - python -m pip install --upgrade pip
 
 install:
     - pip install -r requirements.txt
