add news item for ikiwiki 2.19

diff --git a/doc/news/version_2.19.mdwn b/doc/news/version_2.19.mdwn
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+ikiwiki 2.19 released with [[toggle text="these changes"]]
+[[toggleable text="""
+   * Only try postsignin if no other action matched. Fixes a bug where the
+     user goes back from the signin screen and does something else.
+   * Improve behavior when trying to sign in with no cookies.
+   * Improved the canedit hook interface, allowing a callback function to be
+     returned (and not run in some cases) rather than the plugins directly
+     forcing a user to log in.
+   * opendiscussion: allow editing of the toplevel discussion page,
+     and, indirectly, allow creating new discussion pages.
+   * Add a prereq on Data::Dumper 2.11 or better, needed to dump q// objects.
+   * htmlscrubber: Further work around #365971 by adding tags for 'br/', 'hr/'
+     and 'p/'.
+   * aggregate: Include copyright statements from rss feed as meta copyright
+     directives.
+   * aggregate: Yet another state saving fix (sigh).
+   * aggregate: Add hack to support feeds with invalidly escaped html entities."""]]
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