Merge pull request #359 from yitam/changelog

changelog for 4.1.8-preview

Author: yukiwongky

CHANGELOG.md

@@ -3,6 +3,34 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/) 
 
+## Windows/Linux/MAC 4.1.8-preview - 2017-04-10
+Updated documentation for Readme regarding instructions for Linux and MAC 
+Updated PECL release packages. Here is the list of updates:
+### Added
+- [Connection Resiliency](https://github.com/Microsoft/msphpsql/wiki/Connection-Resiliency) now supported in Windows 
+- [Connection pooling](https://github.com/Microsoft/msphpsql/wiki/Connection-Pooling-on-Linux-and-Mac) now works in MAC 
+
+### Fixed
+#### SQLSRV and PDO_SQLSRV
+- Added a workaround for a bug in unixODBC 2.3.4 when connection pooling is enabled.
+- Fixed the issue in MAC such that which driver is loaded first no longer matters.
+
+#### SQLSRV only
+- Fixed sqlsrv_num_rows() when the client buffered result is null ([issue #330](https://github.com/Microsoft/msphpsql/issues/330)).
+- Fixed conversion warnings because of some const chars ([issue #332](https://github.com/Microsoft/msphpsql/issues/332)).
+
+#### PDO_SQLSRV only
+- Improved performance by implementing a cache to store column SQL types and display sizes ([issue #189](https://github.com/Microsoft/msphpsql/issues/189)).
+- Fixed issue with the unsupported attribute PDO::ATTR_PERSISTENT in connection ([issue #65](https://github.com/Microsoft/msphpsql/issues/65)).
+- Fixed the issue when deleting something that doesn't exist ([issue #336](https://github.com/Microsoft/msphpsql/issues/336)).
+
+### Known Issues
+- User defined data types and SQL_VARIANT ([issue #127](https://github.com/Microsoft/msphpsql/issues/127)).
+- Binary column binding with emulate prepare ([issue #140](https://github.com/Microsoft/msphpsql/issues/140)).
+- When pooling is enabled in Linux or MAC
+  - unixODBC 2.3.1 (Linux) and unixODBC 2.3.4 (MAC) might not return proper diagnostics information, such as error messages, warnings and informative messages
+  - due to this unixODBC bug, fetch large data (such as xml, binary) as streams as a workaround. See the examples [here](https://github.com/Microsoft/msphpsql/wiki/Connection-Pooling-on-Linux-and-Mac)
+
 ## Windows/Linux/MAC 4.1.7-preview - 2017-03-07
 Updated PECL release packages. Here is the list of updates:
 ### Added