message: Use the 2 cores provided by Travis
diff: @@ -40,5 +40,5 @@ jobs:
  - cd build
  - CXX=g++ CC=gcc cmake -DRINGMESH_WITH_GRAPHICS:BOOL=OFF -DRINGMESH_WITH_UTILITIES:BOOL=ON -DRINGMESH_WITH_TESTS:BOOL=ON -DRINGMESH_WITH_TUTORIALS:BOOL=ON ..
  - cd ringmesh/Debug
  - - cmake --build .
  - - ctest
  + - cmake --build . -- -j2
  + - ctest -j2
  