add 0.1.18

Author: xuzeyu91

Directory.Build.props

@@ -1,7 +1,7 @@
 <Project>
   <!-- See https://aka.ms/dotnet/msbuild/customize for more details on customizing your build -->
   <PropertyGroup>
-    <Version>0.1.18</Version>
+    <Version>0.1.18</Version> 
     <SKVersion>1.17.1</SKVersion>  
   </PropertyGroup>
 </Project>

src/GraphRag.Net/Domain/Service/GraphService.cs

@@ -1,6 +1,5 @@
 using GraphRag.Net.Options;
 using GraphRag.Net.Domain.Interface;
-using GraphRag.Net.Domain.Model.Constant;
 using GraphRag.Net.Domain.Model.Graph;
 using GraphRag.Net.Repositories;
 using GraphRag.Net.Utils;