Update version number and release notes

Author: peetw

NHibernate.Spatial.props

@@ -3,7 +3,7 @@
     <!-- Specify version info -->
     <VersionMajor Condition="'$(VersionMajor)' == ''">5</VersionMajor>
     <VersionMinor Condition="'$(VersionMinor)' == ''">1</VersionMinor>
-    <VersionPatch Condition="'$(VersionPatch)' == ''">0</VersionPatch>
+    <VersionPatch Condition="'$(VersionPatch)' == ''">1</VersionPatch>
     <!-- NOTE: Set to "preXYZ" for pre-releases and leave blank for full releases -->
     <VersionSuffix Condition="'$(VersionSuffix)' == ''"></VersionSuffix>
 

releasenotes.txt

@@ -13,6 +13,10 @@ https://nhibernate.jira.com/projects/NHSP
 ...and support questions to NH Users mailing list:
 http://groups.google.com/group/nhusers
 
+Build 5.1.1
+========================
+Limit NHibernate dependency version to 5.1.x to avoid breaking changes in 5.2.x (see #104)
+
 Build 5.1.0
 ========================
 Targets NHibernate 5.1 and .NET Standard 2.0