some minor refactoring, fix another typo ("Outputters")
some minor refactoring, fix another typo ("Outputters")

Signed-off-by: NiteHawk <5758ffa791ed0666fb75085c5624d5e6d66bbc05@users.noreply.github.com>

GuntherStruyf/luaunit,GuntherStruyf/luaunit