.travis.yml: install Boost 1.67 from a PPA

Apparently, Travis-CI will never upgrade its ancient Ubuntu Trusty, so I have to get Boost from somewhere else. Thanks to Martin Hierholzer for his PPA.

.travis.yml: install Boost 1.67 from a PPA
53170ca2 · Max Kellermann · 94694e0f · 53170ca2
Commit 53170ca2 authored Sep 02, 2018 by Max Kellermann
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.travis.yml .travis.yml +4 -2

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--- a/.travis.yml
+++ b/.travis.yml
@@ -8,10 +8,11 @@ matrix:
        apt:
          sources:
            - ubuntu-toolchain-r-test
+            - sourceline: 'ppa:mhier/libboost-latest'
          packages:
            - g++-6
            - libcppunit-dev
-            - libboost-dev
+            - boost1.67
      env:
        - MATRIX_EVAL="export CC=gcc-6 CXX=g++-6"

@@ -21,10 +22,11 @@ matrix:
        apt:
          sources:
            - ubuntu-toolchain-r-test
+            - sourceline: 'ppa:mhier/libboost-latest'
          packages:
            - g++-8
            - libcppunit-dev
-            - libboost-dev
+            - boost1.67
      env:
        - MATRIX_EVAL="export CC=gcc-8 CXX=g++-8"