Notable changes

• Convert AS2 Mention tags to AS1 objectType mention (non-standard) and vice versa (snarfed/bridgy-fed#46).
• Twitter:
  • Bug fix for large block list fetches that get rate limited after a few successful requests.
  • Handle HTTP 403 + error code 200 when fetching retweets for a protected or otherwise unavailable tweet (bridgy#688).
  • Demote @-mentions from person-tags to mentions. Specifically, this means they'll no longer get rendered with u-category mf2.
• Instagram:
  • Disabled in the REST API entirely due to Instagram's aggressive rate limiting and blocking (bridgy#655).
  • Update scraping to handle replies in new edge_media_to_parent_comment field (#164).
  • Use cookie for all scraping HTTP requests, not just for likes.
• microformats2:
  • Revise whitespace handling; use white-space: pre CSS in HTML output.
• Facebook:
  • Bug fix: don't interpret photo.php as username in post URLs.
• Atom:
  • Switch from white-space: pre CSS back to converting newlines to <br>s because some feed readers (eg NewsBlur) follow it too strictly and don't even line wrap.
• RSS:
  • Default title to ellipsized content.