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- Fixed uncaught TypeError exception when converting some Paths to SV…

…G using the latest skia-pathops v0.8.0 (#304, #305, googlefonts/nanoemoji#455).

- Drop support for Python 3.7 (which reached end of life), we now req…

…uires Python 3.8 or greater.

- Added option to --drop_unsupported elements (#298).
- Fixed AttributeError when removing a comment located at the root level, with inplace=True (#301).

- Added ``difference`` method to `picosvg.svg_pathops` (#286).

- Have picosvg remove processing instruction tags (e.g. ``<?xpacket?>``) (#288).
- Added ``allow_text`` option to pass-through text/textPath/tspan elements (#289, #294).
- Added ``bounding_box`` method to ``SVG`` class, returning the bounding box containing all the shapes in the SVG (#290).
- When applying inline CSS style properties to SVG element attributes, ignore properties whose name is not valid XML (e.g. vendor-specific keywords starting with '-') (#295).

- Fixed bug whereby SVG.topicosvg() method was ignoring the ndigits p…

…arameter when inplace=False (#281, #282).

- Fixed ``AssertionError`` when normalizing SVG path containing a deg…

…enerate arc command where the end point is equal to the previous command's end point (#278, #279).

Partial fix for arc reuse; #272

Fix #269, Subpaths that become empty after rounding are not dropped

Fixed arc normalization (#266)