v2.4.0

• Add configs for web application manifest files
  [#29].
• Allow access to the content from within the /.well-known/ directory
  [#31].
• Forbid access to .conf files.
• Add the no-transform value to the Cache-Control HTTP response
  header without overwriting existing values.
• Add cur, ico, svg, svgz and webp to the filename-based
  cache busting list.
• Add configs for text files (.txt)
  [b5bda65].
• Compress WebVTT files (.vtt)
  [0bb12c8].
• Reintroduce the filename extension to content type mappings for ico
  and svg [#28].