**Changes:**
* changed: **requires Python 3.5+ now**
* changed: specifying trackers is now optional with the new ``-t`` switch, thus **trackerless torrents are now
possible**
* added: **bestN shortcut**! It is now possible to add the best N trackers from ngosang/trackerslist (https://github.com/ngosang/trackerslist)
by using the new bestN shortcut
* changed: use **external JSON files for configuration**, by default try to load ``.py3createtorrent.cfg``
from user's home directory
* added: DHT bootstrap nodes can now be specified with the new ``--node`` switch (doing so is recommended for
trackerless torrents)
* added: **webseed support** with the new ``--webseed`` switch (GetRight style, i.e. http://bittorrent.org/beps/bep_0019.html)
* changed: increased max piece size to 16 MiB
* changed: show warning if piece size is not a multiple of 16 KiB
* changed: updated the default trackers (openbt is now opentrackr, dropped publicbt, added cyberia and coppersurfer)
* added: Pipfile and Pipfile.lock for pipenv support
* added: README.md
* changed: improved performance of single file torrent creation
* refactored: switched to bencode.py module for encoding the torrent data
* refactored: switched from optparse to argparse
* refactored: reformatted code with yapf, using a new column limit of 120
* refactored: added type hints to enable analysis with mypy (we use Python's typing module which was added in
Python 3.5, thus Python 3.5 is the new minimum version that is required)