FindMatlab: add R2020b => 9.9
This allows Matlab R2020b (released today) to be recognized as a valid Matlab version.
Backport: release
Topic-rename: FindMatlab-r2020b
Edited by Brad King
This allows Matlab R2020b (released today) to be recognized as a valid Matlab version.
Backport: release
Topic-rename: FindMatlab-r2020b