Update release notes with 5.0 and 4.1 backports

Author: fredericDelaporte

releasenotes.txt

@@ -214,6 +214,14 @@ Release notes - NHibernate - Version 5.1.0
 As part of releasing 5.1.0, a missing 5.0.0 possible breaking change has been added about inequality semantic in LINQ
 queries. See 5.0.0 possible breaking changes.
 
+Build 5.0.6
+=============================
+
+Release notes - NHibernate - Version 5.0.6
+
+** Bug
+    * #1355 NH-3928 - Random invalid SQL generated when using bitwise operators
+
 Build 5.0.5
 =============================
 
@@ -573,6 +581,14 @@ Release notes - NHibernate - Version 5.0.0
     * [NH-4011] - Fix transaction scopes handling
 
 
+Build 4.1.2.GA
+=============================
+
+Release notes - NHibernate - Version 4.1.2.GA
+
+** Bug
+    * #1355 NH-3928 - Random invalid SQL generated when using bitwise operators
+
 Build 4.1.1.GA
 =============================