Switch to GCC 8 on Travis CI

.travis.yml

@@ -2,11 +2,11 @@ language: cpp
 matrix:
   include:
     - os: linux
-      env: LIBTORRENT_BRANCH=master TOOLCHAIN="CXX=g++-7 CC=gcc-7 CPP=cpp-7"
+      env: LIBTORRENT_BRANCH=master TOOLCHAIN="CXX=g++-8 CC=gcc-8 CPP=cpp-8"
     - os: linux
-      env: LIBTORRENT_BRANCH=RC_1_1 TOOLCHAIN="CXX=g++-7 CC=gcc-7 CPP=cpp-7"
+      env: LIBTORRENT_BRANCH=RC_1_1 TOOLCHAIN="CXX=g++-8 CC=gcc-8 CPP=cpp-8"
     - os: linux
-      env: LIBTORRENT_BRANCH=RC_1_0 TOOLCHAIN="CXX=g++-7 CC=gcc-7 CPP=cpp-7"
+      env: LIBTORRENT_BRANCH=RC_1_0 TOOLCHAIN="CXX=g++-8 CC=gcc-8 CPP=cpp-8"
     - os: osx
       env: LIBTORRENT_BRANCH=master
     - os: osx
@@ -15,7 +15,7 @@ matrix:
       env: LIBTORRENT_BRANCH=RC_1_0
   allow_failures:
     - os: linux
-      env: LIBTORRENT_BRANCH=master TOOLCHAIN="CXX=g++-7 CC=gcc-7 CPP=cpp-7"
+      env: LIBTORRENT_BRANCH=master TOOLCHAIN="CXX=g++-8 CC=gcc-8 CPP=cpp-8"
     - os: osx
       env: LIBTORRENT_BRANCH=master
 env:
@@ -33,7 +33,7 @@ addons:
       - libboost1.55-tools-dev
       - libfuse-dev
       - libcurl4-openssl-dev
-      - g++-7
+      - g++-8
 before_install:
   - if [ "$TRAVIS_OS_NAME" == "osx" ]; then
       brew update;