feat: add new features and tests in v1.5.1

This update introduces several enhancements:
- Added caveat handling for relationship creation
- Introduced WriteSchemaAsync method to the client
- Included additional unit tests

The version has been updated from 1.5.0 to 1.5.1 in SpiceDb.csproj file.

README.md

@@ -8,6 +8,13 @@ SpiceDb was created by [AuthZed](https://authzed.com/) and [documentation](https
 SpiceDb.net was created by Michael Tanczos and has contributions from Pavel Akimov, Mahesh Bailwal, Vinícius Gajo, and others.  Documentation for SpiceDb.net is in progress and can be found here:
 [https://jalexsocial.github.io/spicedb.docs/](https://jalexsocial.github.io/spicedb.docs/)
 
+## What's New?
+
+1.5.1 
+- @nexthash added caveat handling for relationship creation
+- added WriteSchemaAsync method to client
+- added additional unit tests
+
 ## Usage
 
 ### Install

SpiceDb/SpiceDb.csproj

@@ -15,7 +15,7 @@
 	<PackageIcon>logo.png</PackageIcon>
 	<PackageLicenseFile>LICENSE.txt</PackageLicenseFile>
 	<PackageReadmeFile>README.md</PackageReadmeFile>
-	<Version>1.5.0</Version>
+	<Version>1.5.1</Version>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">