v0.1.0

• Refactor logging a bit
• Move encoding functionality into a submodule to reduce import size (and
  thus resultant binary size) for url-tool
• Prevent request loop
• Remove custom Denylist support. Filtering should be done on signed url
  generation. rfc1918 filtering retained and internalized so as do reduce
  internal network exposue surface and avoid non-routable effort.
• Inverted redirect boolean. Redirects are now followed by default, and
  the flag no-follow was learned.
• Use new flag parsing library for nicer help and cleaner usage.
• Specify a fallback accept header if none is provided by client.