NEWS: Bumped version number to 1.22.0.
NEWS - OpenPrinting CUPS Filters v1.21.6 - 2018-12-17
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-CHANGES IN V1.21.7
+CHANGES IN V1.22.0
- pdftopdf: Use QPDF for flattening interactive PDF forms
(Issues #2, #23, #36, Pull request #88).
