Update Travis Xcode to 10.3 (#648)

lucasderraugh · web-flow · commit 58183df74fba · 2020-02-10T13:47:13.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,3 +1,3 @@
 language: objective-c
 script: ./travis-build.sh
-osx_image: xcode10.2
+osx_image: xcode10.3
