v0.20.10

MPI v0.20.10

Diff since v0.20.9

Closed issues:

• Different MPIPreferences Configurations for Separate Julia Environments (#731)
• MPIPreferences.use_system_binary() not finding homebrew installation of open-mpi (#733)

Merged pull requests:

• Test GC in multi-thread code (#724) (@alexandrebouchard)
• Fix regex matching MPICH version number (#732) (@giordano)
• Fix some CI failures (#734) (@giordano)
• some explicit precompile statements and precompile-friendly loadtime hooks (#735) (@ranocha)
• Fix typo in precompile statements (#736) (@lcw)
• Bump version (#737) (@lcw)