[Dwarf-discuss] ISSUE: update Dwarf_Version_Numbers.md for DWARF5

[Ben Woodard]

It looks like https://wiki.dwarfstd.org/Dwarf_Version_Numbers.md hasn't 
been brought up to date with DWARF5 yet. This table can be useful 
because the versions of different sections do not necessarily follow the 
major DWARF version.

For example, last year I had a question from a tool author where he was 
confused by the fact that .debug_line file format was only 3 even though 
he was compiling for either DWARF4 or 5 (I don't remember) on the 
command line.

While we are at it and preparing DWARF6 it would be a great hint to tool 
developers to know where they need to focus effort by keeping this table 
up to date with the evolving DWARF6.

-ben