Simplify travis configuration

Author: AdrieanKhisbe

.travis.yml

@@ -1,30 +1,21 @@
 language: node_js
+sudo: required
 
 node_js:
   - "10"
   - "8"
 
-sudo: required
 services:
   - docker
 
 cache: npm
 
-addons:
-  apt:
-    sources:
-      - ubuntu-toolchain-r-test
-    packages:
-      - g++-4.8
-
 env:
   global:
-    - CXX=g++-4.8
     - DOCKER_COMPOSE_VERSION=1.23.2
 
 before_install:
   - sudo rm /usr/local/bin/docker-compose
   - curl -L https://github.com/docker/compose/releases/download/${DOCKER_COMPOSE_VERSION}/docker-compose-`uname -s`-`uname -m` > docker-compose
   - chmod +x docker-compose
   - sudo mv docker-compose /usr/local/bin
-