updated release notes

CHANGELOG

@@ -1,9 +1,27 @@
 This is the changelog file for the POCO C++ Libraries.
 
-Release 1.7.7 (2016-12-XX)
+Release 1.7.7 (2016-12-31)
 ==========================
 
-- TODO
+- fixed GH #865: FileChannel compress fails leaving empty .gz files 
+- fixed GH #990: Potential race condition in Poco::File on Windows 
+- fixed GH #1157: Fixing a bug in the NetSSL_Win module (Host name verification failed error)
+- fixed GH #1351: Fix for android include pthread.h from /usr/include
+- fixed GH #1436: ODBC Bug: Unicode text(NVARCHAT) read from DB is truncated to half
+- fixed GH #1453: _clock_gettime Symbol not found on Mac 10.11
+- fixed GH #1460: POCO does not build with OpenSSL 1.1
+- fixed GH #1461: Poco::Data::SQLite::SQLiteStatementImpl::next() error 
+- fixed GH #1462: AbstractConfiguration::getUInt does not parse hex numbers
+- fixed GH #1464: ODBCMetaColumn::init() always maps integer NUMERIC/DECIMAL to Int32
+- fixed GH #1465: Assertion violation in DateTime.cpp using ZipArchive 
+- fixed GH #1472: HTTP(S)StreamFactory should send a User-Agent header.
+- fixed GH #1476: Fixed error with Poco::UTF8Encoding::isLegal()
+- fixed GH #1484: ODBC: fix uninitialized variable
+- fixed GH #1486: Support ODBC GUID data type as string
+- fixed GH #1488: Poco::ObjectPool shrinks if returned object is not valid
+- fixed GH #1515: Detection of closed websocket connection
+- fixed GH #1521: bug in JSON ParseHandler.cpp (empty keys should be valid) 
+- fixed GH #1526: iOS app rejected, IPv6 not working 
 
 
 Release 1.7.6 (2016-10-18)