[Setup] Updated the Windows release notes.

Redis on Windows Release Notes.md

 MSOpenTech Redis on Windows 3.0 Release Notes
 =============================================
 
+--[ Redis on Windows 3.0.300-alpha2 ] Release date: Aug 20 2015
+
+ - [Cleanup] Code formatting.
+ - [Test] Added a Windows-specific regression test.
+ - [Test] Increated the waiting time before checking the server status.
+ - [Fix] Socket flags not saved.
+ - [Cleanup] Code refacoring.
+ - [Test] Increased the waiting time for some conditions.
+ - [Test] Removed Windows specific code.
+ - [Test] Set maxheap to 150mb to run the cluster tests.
+ - [Fix] getpeername fails to retrieve the master ip address.
+ - [Cleanup] Code refactoring, comments.
+ - [Cleanup] Code refactoring to reduce dependencies between projects.
+ - [Fix] Socket state moved from aeApiState to RFDMap.
+ - [Cleanup] Code refactoring.
+ - [Cleanup] Removed WSACleanup mapping.
+ - [Setup] NuGet description doesn't support Markdown.
+ - [Portability] Explicit type casting.
+ - [Fix] Redis Server stops accepting connections.
+ - [Fix] Set pipe to non-blocking. If the child process has already exite
+ - [Fix] AOF rewrite not working.
+ - [Setup] Release number.
+ - Merged tag 3.0.3 from antirez/3.0 into 3.0
+
+
 --[ Redis on Windows 3.0.100-alpha1 ] Release date: Jul 22 2015
 
  - First alpha based on Redis 3.0.1 [https://raw.githubusercontent.com/antirez/redis/10323dc5feb2adc10c4d62c7d667fd45923d6a57/00-RELEASENOTES]