Update change log

Signed-off-by: Greg Zaverucha <[email protected]>
microsoft · Dec 5, 2018 · 942cd80 · 942cd80
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+Version 4.0 -- 2018-12-05
+* Update implementation to match spec version 2.0. See Appendix A for a summary
+  of the changes. 
+
 Version 3.0 -- 2018-09-06
 * Fix deviations from specification. The KDF was missing the output length as
   input and the public key was incorrectly serialized. Note that this is breaking