Update changelog

changelog.md

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 # Revision history for skylighting
 
+## Next version
+
+  * Wrap lines of source code in a `div` with `display` set to `inline-block`.
+    The `div`s make per-line processing easier. They cannot be set as
+    `display: block` as that introduces extra new lines when copying and pasting.
+  * Render line numbers in html using css pseudo elements rather than a table.
+    The line numbers are always produced, as `data-line-number` attributes, and
+    css to display them as `::before` elements are always produced. The option to
+    switch on line numbering only toggles a class; this means it is possible to toggle
+    line numbering without re-running skylighting.
+  * If the `linkAnchors` option is set, wrap with an `a` element rather than a `div`,
+    set so that clicking the line number (and only the line number) will jump to that
+    line.
+  * Code wraps by default when html is printed, with wrapped lines indented.
+
 ## 0.3.3.1 -- 2017-06-26
 
   * Updated xml syntax definitions and clojure test.