message: Recommend using -march=native
diff: @@ -65,7 +65,7 @@ cd visionaray
  mkdir build
  cd build
  -cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_FLAGS="-std=c++11 -msse4.1"
  +cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_FLAGS="-std=c++11 -march=native"
  make
  make install
  ```
  