build: removed env specification from travis

Author: Alex Werner

.travis.yml

@@ -3,16 +3,6 @@ sudo: false
 node_js:
   - '12'
   - '14'
-env:
-  - CXX=g++-8 CC=gcc-8
-addons:
-  apt:
-    sources:
-      - ubuntu-toolchain-r-test
-    packages:
-      - g++-8
-      - gcc-8
-      - libzmq3-dev
 
 script:
   - npm run check-package