Fix CI build error

Author: sdottaka

.github/workflows/main.yml

@@ -23,5 +23,5 @@ jobs:
     - name: Upload zip
       uses: actions/upload-artifact@v2-preview
       with:
-        name: winwebdiff.zip
+        name: winwebdiff
         path: Dist/winwebdiff-*.zip

src/WinWebDiffTest/WinWebDiffTest.vcxproj

@@ -279,12 +279,12 @@
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
-    <Import Project="..\..\..\..\packages\tencent.rapidjson.1.1.1\build\tencent.rapidjson.targets" Condition="Exists('..\..\..\..\packages\tencent.rapidjson.1.1.1\build\tencent.rapidjson.targets')" />
+    <Import Project="$(SolutionDir)packages\tencent.rapidjson.1.1.1\build\tencent.rapidjson.targets" Condition="Exists('$(SolutionDir)packages\tencent.rapidjson.1.1.1\build\tencent.rapidjson.targets')" />
   </ImportGroup>
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
       <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
     </PropertyGroup>
-    <Error Condition="!Exists('..\..\..\..\packages\tencent.rapidjson.1.1.1\build\tencent.rapidjson.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\packages\tencent.rapidjson.1.1.1\build\tencent.rapidjson.targets'))" />
+    <Error Condition="!Exists('$(SolutionDir)packages\tencent.rapidjson.1.1.1\build\tencent.rapidjson.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)packages\tencent.rapidjson.1.1.1\build\tencent.rapidjson.targets'))" />
   </Target>
 </Project>