[6.0] ceafe79aa Update osx build and drop sudo: false

[Dridi Boukelmoune]

commit ceafe79aa00637efa3fbcbc3cc2606221f2c736f
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Sun Dec 2 18:05:19 2018 +0000

    Update osx build and drop sudo: false

diff --git a/.travis.yml b/.travis.yml
index da2bcbb8b..52424fefc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,5 @@
 ---
 language: c
-sudo: false
 matrix:
   fast_finish: true
   include:
@@ -16,7 +15,7 @@ matrix:
     env: CLANG=7 SAN_FLAGS="--enable-asan --enable-ubsan"
     sudo: required
   - os: osx
-    osx_image: xcode10
+    osx_image: xcode10.1
     compiler: clang
   allow_failures:
   - os: osx