Update README.md

Add @maca88's AsyncGenerator into Credits page

Author: hazzik

README.md

@@ -66,10 +66,12 @@ of NHibernate (in no particular order):
 * [GitHub][] and [SourceForge][] - source code hosting
 * [Atlassian][] - JIRA bug tracker licence and hosting
 * [Log4net][] - logging, by the [Apache Software Foundation][]
-* [JetBrains][] - [ReSharper][] licences for NHibernate developers
+* [JetBrains][] - [ReSharper][] licences for NHibernate developers 
 * [LinFu][] - proxy implementation (Philip Laureano)
 * Iesi.Collections - source code taken from an [article][] written by Jason Smith
 * [Relinq][] - Linq provider for NHibernate
+* [AsyncGenerator][] - Roslyn based async C# code generator by @maca88
+
 
 [NUnit]: http://www.nunit.org
 [Nant]: http://nant.sourceforge.net
@@ -85,3 +87,4 @@ of NHibernate (in no particular order):
 [LinFu]: http://code.google.com/p/linfu
 [article]: http://www.codeproject.com/KB/recipes/sets.aspx
 [Relinq]: http://relinq.codeplex.com/
+[AsyncGenerator]: http://github.com/maca88/AsyncGenerator