Update .travis.yml

Author: flexferrum

.travis.yml

@@ -13,6 +13,30 @@ matrix:
           sources: ['ubuntu-toolchain-r-test']
           packages: ['cmake', 'g++-5', 'libboost-dev']
 
+    - os: linux
+      compiler: gcc
+      env: COMPILER=g++-6
+      addons:
+        apt:
+          sources: ['ubuntu-toolchain-r-test']
+          packages: ['cmake', 'g++-6', 'libboost-dev']
+
+    - os: linux
+      compiler: gcc
+      env: COMPILER=g++-7
+      addons:
+        apt:
+          sources: ['ubuntu-toolchain-r-test']
+          packages: ['cmake', 'g++-7', 'libboost-dev']
+
+    - os: linux
+      compiler: clang
+      env: COMPILER=clang++-5.0
+      addons:
+        apt:
+          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-5.0']
+          packages: ['cmake', 'clang-5.0', 'g++-6', 'libboost-dev']
+
 
 script:
   - if [[ "${COMPILER}" != "" ]]; then export CXX=${COMPILER}; fi