No need for g++ on Travis.

Due to df67141.

Author: RubenVerborgh

.travis.yml

@@ -4,15 +4,8 @@ node_js:
   - "8.0"
   - "10.0"
   - "node"
-env:
-  - CXX=g++-4.8
 
 addons:
-  apt:
-    sources:
-      - ubuntu-toolchain-r-test
-    packages:
-      - g++-4.8
   hosts:
     - nic.localhost
     - tim.localhost
@@ -27,6 +20,5 @@ script:
   - npm run nyc
 
 cache:
-  apt: true
   directories:
     - node_modules