update ChangeLog

Author: aquynh

ChangeLog

@@ -1,6 +1,16 @@
 This file details the changelog of Keypatch (http://keystone-engine.org/keypatch).
 
 
+---------------------------------
+Version 2.1: January 17th, 2017
+
+- Better documentation for Linux & Windows installs.
+- Added a new function to search for assembly instructions, so it is easy to grep
+  for ROP gadgets in the binary. This will be helpful for exploitation writers.
+- Removed the "Assembler" function, which is redundant since now you can also do
+  that with the "Search" function above.
+
+
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 Version 2.0.1: September 15th, 2016