Update .luacheckrc to Luacheck 0.19 format
Update .luacheckrc to Luacheck 0.19 format

This new format has a less wacky syntax for read/write and read-only
globals, and also allows fields of globals to be specified.

Grocel/wire,thegrb93/wire,sammyt291/wire,wiremod/wire,garrysmodlua/wire,dvdvideo1234/wire,NezzKryptic/Wire,bigdogmat/wire