.travis.yml: switch to GCC 6

After commit a72d1200, the Travis-CI build fails, because we have been using GCC 5 there... so let's switch to GCC 6 to test the oldest possible GCC version.

.travis.yml: switch to GCC 6
d88e00c0 · Max Kellermann · a72d1200 · d88e00c0
Commit d88e00c0 authored Jul 06, 2018 by Max Kellermann
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.travis.yml .travis.yml +2 -2

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--- a/.travis.yml
+++ b/.travis.yml
@@ -9,11 +9,11 @@ matrix:
          sources:
            - ubuntu-toolchain-r-test
          packages:
-            - g++-5
+            - g++-6
            - libcppunit-dev
            - libboost-dev
      env:
-        - MATRIX_EVAL="export CC=gcc-5 CXX=g++-5"
+        - MATRIX_EVAL="export CC=gcc-6 CXX=g++-6"
    - os: osx
      osx_image: xcode9.3beta