refactor: 增加多版本号配置

Author: ArgoZhang

src/BootstrapBlazor/BootstrapBlazor.csproj

@@ -1,9 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk.Razor">
 
-  <PropertyGroup>
+  <PropertyGroup Condition="'$(VisualStudioVersion)' == '17.0'">
     <Version>9.11.5-beta01</Version>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(VisualStudioVersion)' == '18.0'">
+    <Version>10.0.0-rc.2.1.0</Version>
+  </PropertyGroup>
+
   <ItemGroup>
     <Content Remove="Locales\*.json" />
     <EmbeddedResource Include="Locales\*.json" />