Fix for build on Linux #6

.travis.yml

@@ -1,7 +1,7 @@
 language: cpp
 sudo: required
 os: linux
-dist: trusty
+dist: bionic
 
 branches:
   only:
@@ -11,21 +11,6 @@ compiler:
   - clang
   - gcc
 
-matrix:
-  include:
-    - os: linux
-      addons:
-        apt:
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-5.0
-          packages:
-            - g++-7
-            - clang-5.0
-      env:
-        - MATRIX_EVAL="CC=gcc-7 && CXX=g++-7"
-        - MATRIX_EVAL="CC=clang-5.0 && CXX=clang++-5.0"
-
 before_script:
   - sudo apt-get install
   - eval "${MATRIX_EVAL}"