docs(web): write about --map-<LANG>=%REXPR% to NEWS file

Signed-off-by: Masatake YAMATO <[email protected]>

Author: masatake

docs/news/HEAD.rst

@@ -18,6 +18,15 @@ New column, VER in the output of ``--list-{kinds-full,roles,fields,extras,pseudo
     Indicates the versions of ctags output (or the parser) introducing the
     item in the list.
 
+Extend ``--map-<LANG>=`` and ``--langmap=`` options to choose a parser using regular expressions
+
+	``--map-<LANG>=[+]%REXPR%`` (or ``--langmap=<LANG>:[+]%REXPR%``) maps relative-paths
+	that match the regular expression to the given language.
+
+	The new ``--list-map-rexprs`` lists all regular-expression-based mappings.
+
+	``--list-maps`` has also been extended to include regular-expression-based mappings.
+
 Incompatible changes
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