Update version number and release notes

Author: peetw

NHibernate.Spatial.props

@@ -6,7 +6,7 @@
     <VersionMinor Condition="'$(VersionMinor)' == ''">0</VersionMinor>
     <VersionPatch Condition="'$(VersionPatch)' == ''">0</VersionPatch>
     <!-- NOTE: Set to "preXYZ" for pre-releases and leave blank for full releases -->
-    <VersionSuffix Condition="'$(VersionSuffix)' == ''">pre001</VersionSuffix>
+    <VersionSuffix Condition="'$(VersionSuffix)' == ''"></VersionSuffix>
 
     <!-- NOTE: Generally shouldn't need to edit anything below this line -->
     <VersionPrefix>$(VersionMajor).$(VersionMinor).$(VersionPatch)</VersionPrefix>

releasenotes.txt

@@ -13,6 +13,16 @@ https://nhibernate.jira.com/projects/NHSP
 ...and support questions to NH Users mailing list:
 http://groups.google.com/group/nhusers
 
+Build 6.0.0
+========================
+All changes from 6.0.0-pre001, plus:
+
+Ensure that Z/M ordinates of 3D/4D PostGIS geometries are saved to the database (see #120)
+Methods marked as obsolete in previous releases have now been removed
+Update NHibernate to 5.3.3
+Update NetTopologySuite to 2.1.0 (and limit to < 3.0)
+Limit Npgsql version to < 4.0 (see #123)
+
 Build 6.0.0-pre001
 ========================
 Update NetTopologySuite to 2.0