update changelog

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diff --git a/ChangeLog b/ChangeLog
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--- a/ChangeLog
+++ b/ChangeLog
@@ -31,6 +31,26 @@ LibreSSL Portable Release Notes:
 This release primarily addresses a number of security issues in coordination
 with the OpenSSL project.
 
+2.2.0 - Build cleanups and OS support
+
+        * AIX Support - thanks to Michael Felt
+
+        * Cygwin Support - thanks to Corinna Vinschen
+
+        * Refactored build macros, support packaging libtls independently.
+          There are more pieces required to support building and using OpenSSL
+          with libtls, but this is an initial start at providing an
+          independent package for people to start hacking on.
+
+        * Removal of OPENSSL_issetugid and all library getenv calls.
+          Applications can and should no longer rely on environment variables
+          for changing library behavior. OPENSSL_CONF/SSLEAY_CONF is still
+          supported with the openssl(1) command.
+
+        * libtls API and documentation additions
+
+        * Various bug fixes and simplifications to libssl and libcrypto
+
 2.1.6 - Security update
 
         * Fixes for the following issues are integrated into LibreSSL 2.1.6: