Ryan Haining

Fixes #43

Build fails on new NDK with ``` FAILURE: Build failed with an exception. * What went wrong: A problem occurred configuring project ':app'. > No toolchains found in the NDK...

The docs say > The `target` attribute is permitted provided `rel="noopener"` is set. simple-html should also permit `target` with `rel="noreferrer"`, since [noreferrer implies noopener](https://html.spec.whatwg.org/multipage/links.html#link-type-noreferrer)

For example: filter should accept [`std::move_only_function`](https://en.cppreference.com/w/cpp/utility/functional/move_only_function/move_only_function)

Recent libc++ checks that an iterators `reference` type matches its `operator*`'s return type. This isn't the case across itertools and must be addressed. Testing with https://github.com/llvm/llvm-project/commit/36c746ca2d5b325a7ac64135c1ff8774c06ab34c

Update range() for additional features in python's range

5

Give a range object `r` - `r.start()`, `r.stop()`, and `r.stop()` constexpr member functions to match the `.start`, `.stop`, and `.step` properties. - `r.size()` and `r.length()` to match `len(r)` - `r[index]`

[c++17] replace boost optional with std::optional in zip_longest

7

- update examples/zip_longest_examples.cpp to use structured bindings - update README example to use structured bindings

The correct mimetype for APNG images is [`image/apng`](https://wiki.mozilla.org/APNG_Specification#MIME_type), but because APNG uses the same 8 header bytes as PNG, APNG matches [the PNG magic number](https://github.com/dart-lang/mime/blob/ca9f059d2334bb2657683e0a7f5949817cb4b0e6/lib/src/magic_number.dart#L105). The [js file-type library](https://github.com/sindresorhus/file-type/blob/700cf1598bf7661ced25d9e4d8b249c0cdb063cb/core.js#L1115) has...

My recs

1

Good job dudes. This is mostly academic or "modernizing" stuff. Only the change in http.cpp fixes an actual problem. Bringing down the makefile is pretty good to know too, IMO,...

The correct mimetype for APNG images is [`image/apng`](https://wiki.mozilla.org/APNG_Specification#MIME_type), but because APNG uses the same 8 header bytes as PNG, APNG matches [the PNG magic number](https://github.com/dart-lang/mime/blob/ca9f059d2334bb2657683e0a7f5949817cb4b0e6/lib/src/magic_number.dart#L105). The [js file-type library](https://github.com/sindresorhus/file-type/blob/700cf1598bf7661ced25d9e4d8b249c0cdb063cb/core.js#L1115) has...