Log Message:
sfeed: Update to 0.9.10

Changes:
0.9.10
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 - Disable If-Modified-Since by default in sfeed_update
 - Misc bug fixes and improvements

0.9.9
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 - Add sfeed_atom to convert one or more feeds from TSV back to Atom
 - Rename fetchfeed() to feed() in sfeed_update
 - Add support for first <enclosure> as 8th field
 - Misc bug fixes and improvements