Update to a more modern macOS image (#909)

alex · web-flow · commit ba75cac973be · 2020-04-07T14:34:57.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -14,7 +14,7 @@ matrix:
   include:
   - language: generic
     os: osx
-    osx_image: xcode10.1
+    osx_image: xcode11.3
     env: TOXENV=py27
   - python: "2.7"
     env: TOXENV=py27
