Update CI jobs
This MR updates the CI jobs to properly print the sequence and branch name, which stopped working since we were using italics and bold.
- Update CPU configuration to -n 100 -m 100 -r 200.
- Update compilers used in CI to be latest supported versions of gcc and clang (gcc-9 and clang-10).
- Readme reflects the compiler update as well.
Edited by Daniel Hugo Campora Perez