[master] 67d5be2 Switch to clang 6.0

[Federico G. Schwindt]

commit 67d5be2da562a90f24fc6286c48f7b58f1887f4c
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Mon Jan 22 01:33:44 2018 +0000

    Switch to clang 6.0

diff --git a/.travis.yml b/.travis.yml
index ef8a2ee..4b310be 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,13 +12,13 @@ matrix:
   - os: linux
     dist: trusty
     compiler: clang
-    env: CLANG=5.0 SAN_FLAGS="--enable-asan --enable-ubsan"
+    env: CLANG=6.0 SAN_FLAGS="--enable-asan --enable-ubsan"
   - os: osx
     osx_image: xcode9.2
     compiler: clang
   allow_failures:
   - os: osx
-  - env: CLANG=5.0 SAN_FLAGS="--enable-asan --enable-ubsan"
+  - env: CLANG=6.0 SAN_FLAGS="--enable-asan --enable-ubsan"
 addons:
   apt:
     packages: