Check for trailing whitespace in Travis

.travis.yml

@@ -26,6 +26,7 @@ env:
         - BUILD_SHARED_LIBS=ON
         - BUILD_SHARED_LIBS=OFF
 script:
+    - if grep -Inr '\s$' src include docs deps tests examples CMake *.md .gitattributes .gitignore .github; then echo Trailing whitespace found, aborting.; exit 1; fi
     - mkdir build
     - cd build
     - cmake -DCMAKE_VERBOSE_MAKEFILE=ON -DBUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} ..