mdcat-0.18.0

Added

• Add mdcat::Error as type alias to std::io::Error.

Changed

• New simpler rendering algorithm (see GH-142) which solves numerous rendering issues (see below).
• Handle internal errors with anyhow to add more context to errors (see GH-139).
• mdcat::push_tty only fails with std::io::Error: mdcat never visibly
  fails unless it can’t write output.

Fixed

• Respect --local-only and resource access policy; this got lost in some
  refactoring (see GH-146).
• Consistent margins and newlines around paragraphs, HTML blocks and inside list
  items (see GH-142).
• Correctly indent nested code blocks in lists and block quotes (see GH-142).
• No longer print leading blank lines before lists (see GH-142).
• Correctly indent block quotes (see GH-142).
• Colorize the entire text of links (see GH-142).