Fix for build on Linux #6
diff --git a/.travis.yml b/.travis.yml
index dc42bc8..c1e22d0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: cpp

 sudo: required

 os: linux

-dist: trusty

+dist: bionic

 

 branches:

   only:

@@ -11,21 +11,6 @@
   - 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}"