Fix for build on Linux #4
diff --git a/.travis.yml b/.travis.yml
index 1e6b4af..dc42bc8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,8 +11,24 @@
   - 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 

+  - sudo apt-get install

+  - eval "${MATRIX_EVAL}"

 

 install:

   - wget https://github.com/premake/premake-core/releases/download/v5.0.0-alpha15/premake-5.0.0-alpha15-linux.tar.gz -O premake-5.0.0-alpha15-linux.tar.gz