pdfSweep 2.0.6

This is the first release of pdfSweep for a while, but this is what's changed here:

• pdfSweep could cause an exception when dealing with images using an indexed color space, where it would try to fill the redacted area with the incorrect color. It will now pick a color that exists within the palette
• editing of content streams could cause Acrobat Reader to fail when reading the document.

BUGS

• cleaning is attempted with white color even for indexed CS images without white color in palette
• 'BMC' content stream operator gets replaced with '<<>> BDC' which is redundant