• This module now uses Go modules. Requested by Matthew Rothenberg.
  GitHub #49.
• Plan 9 is now supported. Pull request by Jacob Moody. GitHub #61.
• Documentation fixes. Pull request by Olaf Alders. GitHub #62.
• Thread-safety is now mentioned in the documentation. Requested by
  Ken Sedgwick. GitHub #39.
• Fix off-by-one error in file offset safety check. Reported by Will
  Storey. GitHub #63.