*: update macos image

BusyJay · BusyJay · commit 9c25f03c9af3 · 2020-01-09T21:55:18.000+08:00
Signed-off-by: Jay Lee &lt;busyjaylee@gmail.com&gt;
diff --git a/.travis.yml b/.travis.yml
@@ -49,6 +49,7 @@ matrix:
 
   - os: osx
     rust: stable
+    osx_image: xcode10.2
 
 addons:
   apt:
