Add more platforms to CI builds
added
- Ubuntu latest (currently 18.04.3 LTS)
- CMake 3.10.2, g++ 7.4.0-1ubuntu1~18.04.1
- Ubuntu rolling (currently 19.10)
- CMake 3.13.4, g++ 9.2.1-9ubuntu2
- Ubuntu devel (currently 20.04 preview)
- CMake 3.15.4, g++ 9.2.1-28ubuntu1
- CentOS 8
- CMake 3.11.4, g++ 8.3.1
Closes #11 (closed)
Edited by Marco Clemencic