v4.0.0-rc.3

Breaking Changes

• ArgAction::Set, ArgAction::SetTrue, and Arg::Action::SetFalse now
  conflict by default to be like ArgAction::StoreValue and
  ArgAction::IncOccurrences, requiring cmd.args_override_self(true) to override instead (#4261)
• (help) Line wrapping of help is now behind the existing wrap_help feature flag, either enable it or hard code your wraps (#4258)

Features

• Add From<&OsStr>, From<OsString>, From<&str>, and From<String> to value_parser! (#4257)
• Added StyledStr::ansi() to Display with ANSI escape codes
• (error) Added Error::render which returns a StyledStr
• (help) Command::render_usage now returns a StyledStr
• (help) Command::render_help and Command::render_long_help which returned StyledStr
• (help) Command::render_usage now returns a StyledStr which returned StyledStr