g++-7 should already be default on bionic.

Author: meisterT

.travis.yml

@@ -7,10 +7,7 @@ addons:
       - pkg-config
       - libboost-dev
       - libgmp-dev
-      - g++-7
 before_install:
   - go get -v github.com/bazelbuild/bazelisk
-  - sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-7 90
-  - sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 90
 script:
   - /home/travis/gopath/bin/bazelisk test //:test