v0.52.0-beta.1

Features

• make ChannelWriteHalf::make_writer[_ext] public, fix #498 (#499) #499 (Mingwei Samuel)
• add ChannelReadHalf::make_reader[_ext], #498 (#502) #502 (Mingwei Samuel)
• ec273f8: Add Handle::send_keepalive (#511) (Uli Schlachter) #511
• fd9da16: Added client::Handle::debug (#510) (Pascal Grange) #510

Fixes

• 20ea6a0: Handle unexpected EOF as expected in session closure (#495) (lgmugnier) #495
• 6a6fa80: make ChannelCloseOnDrop async
• c2fa2df: fixed #506 - removed faulty server-sig-algs timeout on wasm (#508) #508