2.1.0 Release Candidate 1
* optimize torrent_handle::torrent_file()
* add option to not validate v1 hashes for hybrid torrents
* add post_file_status() to query them asynchronously
* add post_file_priorities() to query them asynchronously
* fix local service discovery not being correctly staggered
* add an experimental multi-threaded, pread()-based, disk I/O backend (pread_disk_io)
* make the save path for part files configurable
* retry failed SAM connection (for i2p)
* deprecated remap_files(), and prevent it from breaking v2 torrents
* fix peer_info holding an i2p destination
* implement i2p_pex, peer exchange support for i2p torrents
* deprecate torrent_alert::torrent_name()
* requires OpenSSL minimum version 1.1.0 with SNI support
* try harder to bind TCP and UDP sockets to the same port
* made disk_interface's status_t type a flags type
* optimize resume data format to use less space
* add a simpler overload to bencode() returning a vector<char>
* introduced a new API for creating torrents, enabling file_storage optimizations
* default build to not include functions deprecated in libtorrent 1.1 and earlier
* add comment, created_by and creation_date to add_torrent_params
* move session_flags to session_params
* the entry class is now a standard variant type
* use std::string_view instead of boost counterpart
* libtorrent now requires C++17 to build
* added support for WebTorrent
Full Changelog: v2.0.12...v2.1.0-rc1