Update .travis.yml

Change language to cpp

.travis.yml

@@ -1,10 +1,9 @@
-language: python
-virtualenv:
-  system_site_packages: true
-python:
-  - "2.7"
+language: c++
+compiler:
+  - gcc
+  - clang
 
-install: 
+before_script: 
   - gcc -v
   - mkdir build
   - cd build