add news item for ikiwiki 3.13

diff --git a/doc/news/version_3.13.mdwn b/doc/news/version_3.13.mdwn
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+ikiwiki 3.13 released with [[!toggle text="these changes"]]
+[[!toggleable text="""
+   * ikiwiki-transition: If passed a nonexistant srcdir, or one not
+     containing .ikiwiki, abort with an error rather than creating it.
+   * Allow underlaydir to be overridden without messing up inclusion
+     of other underlays via add\_underlay."""]]
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