Segno

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* Updated and fixed docs
* Added PyPy 3 to test environment

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* Added experimental support for Structured Append (divide content into max.
16 QR Code symbols)
* Internal refactoring (i.e. segno/scripts/cmd.py -> segno/cli.py)
* Added ``-s`` shortcut to Segno's command line interface to provide the scaling factor
* Added ``-b`` shortcut to Segno's command line interface to provide the border / quiet zone
* CLI accepts unquoted, whitespace separated content:
``segno "Comfortably Numb"`` can be written as ``segno Comfortably Numb``

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* Fixed `33 <https://github.com/heuer/segno/issues/33>`_:
Some Micro QR Codes may be unreadable due to wrong
format information. Further, M1 and M3 codes may be wrong due to wrong
encoding of final data symbol character (8 bits instead of (correct) 4 bits).
Thanks to `Nicolas Boullis <https://github.com/nboullis>`_ for the bug report,
initial fix, tests and patience.
* Fixed `34 <https://github.com/heuer/segno/issues/34>`_:
Change default error level from "M" to "L" to avoid surprises that
the content does not fit into the provided version. This change is somewhat
backwards incompatible.
* Fixed `35 <https://github.com/heuer/segno/issues/35>`_:
Check of user supplied mask pattern index was wrong.
* Fixed `36 <https://github.com/heuer/segno/issues/36>`_:
Wrong placement of codeword in M1 and M3 symbols.
* Fixed `37 <https://github.com/heuer/segno/issues/37>`_:
Generation of M1 / M3 symbols fail if the data modules are
completely filled.
* Fixed `38 <https://github.com/heuer/segno/issues/38>`_:
Optimized mask pattern choosing algorithm: If the user supplied
a preferred mask, the mask evaluation step is skipped and the preferred mask
is chosen
* Added more internal checks to ensure correct (Micro) QR Codes; provided
helpful exceptions
* Removed ``writers.get_writable`` (replaced by ``writers.writable``)
* Added support for serializing QR Codes as XBM (X BitMap) (supports
black / white images)
* Added support for serializing QR Codes as XPM (X PixMap) (supports colors and
transparency)
* Added support for encoding contact information as vCard version 3.0
(``segno.helpers``)
* Added -V shortcut to Segno's command line script to show version information
* Better test coverage for command line script
* Better test coverage for M1 and M3 symbols

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* Fixed `27 <https://github.com/heuer/segno/issues/27>`_:
Email URI is wrong if CC or BCC is used.
* Fixed `32 <https://github.com/heuer/segno/issues/32>`_:
Don't add version attribute if SVG >= 2.0
* Deprecated ``writers.get_writable``; use ``writers.writable``
``writers.writable`` closes file-like objects automatically (if necessary);
replace ``writable, must_close = writers.get_writable(filename_or_buffer, mode)``
with ``with writers.writable(filename_or_buffer, mode) as f``
* Added option to PNG serializer to specify an optional DPI value
(thanks to Markus Ueberall for support)
* Added PAM (Portable Arbitrary Map) as serialization format (supports colors
and transparency)

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* Command line script reports Segno's version (``--ver``) and the version
is also mentioned in the help message (``-h``) (`24 <https://github.com/heuer/segno/issues/24>`_)
* Support for creating email addresses or complete messages (``segno.helpers``)
* Internal optimizations and more correct minimal version finding
(`26 <https://github.com/heuer/segno/issues/26>`_)

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* Fixed Python packaging (source distribution did not work), again