Update version number and release notes

Author: Peet Whittaker

NHibernate.Spatial.props

@@ -3,7 +3,7 @@
     <!-- Specify version info -->
     <!-- https://andrewlock.net/version-vs-versionsuffix-vs-packageversion-what-do-they-all-mean/ -->
     <VersionMajor Condition="'$(VersionMajor)' == ''">6</VersionMajor>
-    <VersionMinor Condition="'$(VersionMinor)' == ''">0</VersionMinor>
+    <VersionMinor Condition="'$(VersionMinor)' == ''">1</VersionMinor>
     <VersionPatch Condition="'$(VersionPatch)' == ''">0</VersionPatch>
     <!-- NOTE: Set to "preXYZ" for pre-releases and leave blank for full releases -->
     <VersionSuffix Condition="'$(VersionSuffix)' == ''"></VersionSuffix>

releasenotes.txt

@@ -13,6 +13,11 @@ https://nhibernate.jira.com/projects/NHSP
 ...and support questions to NH Users mailing list:
 http://groups.google.com/group/nhusers
 
+Build 6.1.0
+========================
+Replace System.Data.SqlClient with Microsoft.Data.SqlClient (see #128)
+Update NuGet packages
+
 Build 6.0.0
 ========================
 All changes from 6.0.0-pre001, plus: