Merge pull request #1133 from lightninglabs/dev/upgrade-osx-image

Upgrade travis osx_image to Xcode 10.2.1 on macOS 10.14

Author: tanx

.travis.yml

@@ -5,7 +5,7 @@ node_js:
 matrix:
   include:
     - os: osx
-      osx_image: xcode9.3
+      osx_image: xcode10.2
     - os: linux
       sudo: required
       dist: trusty