[master] e6ace0955 Bump osx image

[Federico G. Schwindt]

commit e6ace0955e935fffea0af3bb854c6442da981708
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Mon Jun 24 11:48:28 2019 +0100

    Bump osx image
    
    Hopefully this has a newer version of brew that fixes the outdated error
    we are currently experiencing.

diff --git a/.travis.yml b/.travis.yml
index 35053aac7..5de9b6b3b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -54,7 +54,7 @@ jobs:
         - ./configure --enable-developer-warnings --enable-debugging-symbols --disable-stack-protector --with-persistent-storage --enable-asan --enable-ubsan
     - stage: test
       os: osx
-      osx_image: xcode10.1
+      osx_image: xcode10.2
       compiler: clang
       addons:
         homebrew: