v0.1.0: Initial release

New:
  * Subdir hosting
  * Symlinks not followed by default (`-s` switch to do so)
  * Root not required
  * Index generation for directories
  * Lack of caching
  * Default hosted directory is current working dir
  * Default port is first free one from `8000` up to `9999`
  * 501 Not Implemented as a default response to unimplemented features (like a POST request)
  * Correct MIME type for served files
  * Simple templating of generated responses
  * Request methods: OPTIONS, GET, HEAD and TRACE
  * Proper handling of percent-encoded URLs (like `асдф fdsa`)