Segno

-------------------
* Added support for multiple (more than two) colors to SVG
(fixes `64 <https://github.com/heuer/segno/issues/64>`_)
* Fixed several test cases
* Removed ``QRCodeError`` and all derived exceptions from public API (still
available but not thrown and they will be removed in 0.4.0)
* Documentation improvements

-------------------
* Documentation improvements: Added several examples, fixed docs
* Fixed `62 <https://github.com/heuer/segno/issues/62>`_:
PNG serializer adds only those colors to the PLTE which are
actually needed for the given (Micro) QR Code.
* Minor performance improvements

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* Backwards incompatibility change: QRCode.show() uses "dark" instead of
"color" and "light" instead of "background" to define the color of
the dark / light modules
* Backwards incompatibility change: All ``segno.writers`` use "dark" instead of
"color" and "light" instead of "background". This does not affect normal users,
but only users of the low level API.
* Changed the keyword for setting the color of the dark modules from
"color" to "dark" and for setting the light modules from "background"
to "light"
The former keywords are still supported. Their usage will issue a
DeprecationWarning in the future.
* Added ``--dark`` and ``--light`` to the command line interface, see point
above. --color and ``--background`` are still supported.
* Fixed typos, improved documentation

-------------------
* Added support for colorful (more than two colors) QR Codes to the CLI script
(fixes `58 <https://github.com/heuer/segno/issues/58>`_).
* Fixed Read the Docs build
* Improved documentation
* Minor performance and code improvements.

-------------------
* Fixed issue `54 <https://github.com/heuer/segno/issues/54>`_:
After last change (see 0.3.3), white background with transparent
QR Code did not work. Enhanced test suite to cover all possible inputs
for PNG grayscale mode
* Removed interpretation of ``addad`` from PNG serializer.
Contradicts the claim to create small images by default.
It still belongs to the function signature but will be removed in release 0.4.0
* The option ``--no-ad`` (CLI) is still available but ignored and will be removed
in release 0.4.0. Removed the option from man page.
* Added option to PNG serializer to provide more than two colors. Each module
type may have its own color.
* Added support for EPC QR Codes.
* Fixed bug in ``helpers.make_vcard_data`` function (the "source" URL was not
used, but the usual URL was added to the SOURCE field)
* Better test coverage for the ``segno.helpers`` module

-------------------
* Fixed issue `54 <https://github.com/heuer/segno/issues/54>`_:
PNGs with white color and transparent background were rendered
as transparent PNG with a *black* QR Code.
* Removed test environments CPython 3.4 and 3.6 from tox
* Improved documentation
* Refactored source code
* Added test cases
* Fixed bugs in ``helpers.make_vcard_data`` function
(superfluous semicolon in birthday line, check geo coordinates)
* Renamed ``utils.matrix_iter_detail`` into ``utils.matrix_iter_verbose``.
Kept ``matrix_iter_detail`` for backwards compatibility (deprecated, will be