tqdm v4.48.0 stable

• add tqdm.asyncio (#1004, #772, #91 <- #65)
  • supports async iterables (async for row in tqdm(iterable))
  • supports iterables
  • supports coroutine.send (tqdm(coroutine).send)
  • add as_completed wrapper (for f in tqdm.as_completed(fs))
• reduce contrib.discord logging verbosity
• fix potential pandas() modifying **kwargs bug
• update documentation
  • add missing inline docstrings
  • update contributing notes
  • update readme
  • add to examples/ folder
    • async_coroutines
    • coroutine_pipe
  • standardise variable naming
• add tests
  • add benchmark tests against popular alternative libraries
  • test new functionality
  • more thorough miniters test (#1003)
• misc framework updates
  • tidy changelog helper
  • add helper bots
    • comment-bot /tag
    • post-release-bot
      • wiki updater
      • website updater
    • benchmark regressions
      • full/thorough test on schedule & release
      • quick test on PR