preparing Changelog for 2.40.0 release

diff --git a/ChangeLog b/ChangeLog
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+November 26, 2016
+    - Release 2.40.0
+       - number rounding added to SVG renderer (same as PS and TK rounding) to
+       aid regression testing.
+       - additional regressson test framework, used in Travis CI builds. (Erwin
+       Janssen)
+       - Allow user to specify clustering algorithm in gvmap.
+       - Add Sierpinski graph generator to gvgen
+       - Extensive code cleanup (Erwin Janssen)
+       - Removal of libgd source - use vanilla libgd from separate install 
+       - Windows builds (Erwin Janssen)
+       - Appveyor CI for Mac builds (Erwin Janssen)
+       - Travis CI for Fedora/Centos builds (Erwin Janssen)
+       - Added JSON output format, -Tjson  (Emden Gansner)
+       - Resolves bugs: 2599, 
 June 18, 2016
        - Experimenting with Travis CI
 February 13, 2016