Update .travis.yml

Author: searchivarius

.travis.yml

@@ -17,11 +17,11 @@ addons:
     sources:
     - ubuntu-toolchain-r-test
     packages:
-    - g++-4.8
+    - g++-4.9
 
 before_install:
 - |
-  if [ "$TRAVIS_OS_NAME" = "linux" ]; then export CXX=g++-4.8 CC=gcc-4.8; fi
+  if [ "$TRAVIS_OS_NAME" = "linux" ]; then export CXX=g++-4.9 CC=gcc-4.9; fi
   if [ "$TRAVIS_OS_NAME" = "osx" ] && [ "${PYTHON:0:1}" = "3" ]; then
       brew update
       brew install python3