README: Describe meaning of copyright year ranges.
authorBen Pfaff <blp@cs.stanford.edu>
Sun, 2 Jan 2011 16:37:31 +0000 (08:37 -0800)
committerBen Pfaff <blp@cs.stanford.edu>
Sun, 2 Jan 2011 18:52:34 +0000 (10:52 -0800)
This is required by the GNU maintainers guide as a prerequisite for using
copyright year ranges.  So far, PSPP itself doesn't use ranges, but Gnulib
(which PSPP uses) does.


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