Update VS Code csproj example to target version 1.0.2. (#849)

* Update target version to 1.0.2.

* Change to target latest 1.x stable.

docs/guides/getting_started/samples/project.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Discord.Net" Version="1.0.0-rc-00617" />
+    <PackageReference Include="Discord.Net" Version="1.*" />
   </ItemGroup>
 
 </Project>