format/ranges.h missing const qualifier on format member function

[andijcr]

fmt/include/fmt/ranges.h

Line 388 in ecd6022

auto format(U& range, FormatContext& ctx) -> decltype(ctx.out()) {

this member function could use const qualifier, maybe also constexpr.

I was getting this error, before adding const to my local copy
ranges.h:525:27: error: passing ‘std::__tuple_element_t<0, std::tuple<fmt::v8::formatter<std::array<unsigned char, 8>, char, void>, fmt::v8::formatter<long unsigned int, char, void> > >’ {aka ‘const fmt::v8::formatter<std::array<unsigned char, 8>, char, void>’} as ‘this’ argument discards qualifiers

[vitaut]

Could you submit a PR?

[andijcr]

Thanks!