tree cf5edb2d3735b44799764085e7dd88f98afeacc3
parent 4a4e22190122a839094e44f0525ee542ac5fabdc
author Patrick Williams <patrick@stwcx.xyz> 1618430124 -0500
committer Patrick Williams <patrick@stwcx.xyz> 1618430176 -0500

cpp: bump desired C++ standard to C++20

C++20 has been final for over 6 months now and has sufficient
compiler support in the compilers we use.  Bump the documentation
to specify we should be using C++20 now.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I1917b24a8e225393daf81249ce1ab8e804882eef