fix RequestContext compatible with old versions

Author: Ahoo-Wang

SmartSql/RequestContext.cs renamed to SmartSql/Abstractions/RequestContext.cs

@@ -5,7 +5,7 @@
 using System.Reflection;
 using System.Text;
 
-namespace SmartSql
+namespace SmartSql.Abstractions
 {
     /// <summary>
     /// Sql 请求上下文

SmartSql/SmartSql.csproj

@@ -10,11 +10,11 @@
     <PackageProjectUrl>https://github.com/Ahoo-Wang/SmartSql</PackageProjectUrl>
     <RepositoryUrl>https://github.com/Ahoo-Wang/SmartSql</RepositoryUrl>
     <PackageRequireLicenseAcceptance>False</PackageRequireLicenseAcceptance>
-    <Version>2.1.0.0-preview</Version>
+    <Version>2.1.0.0-preview2</Version>
     <AssemblyVersion>2.1.0.0</AssemblyVersion>
     <FileVersion>2.1.0.0</FileVersion>
     <PackageTags>orm dapper sql read-write-separation cache  redis dotnet-core cross-platform high-performance distributed-computing zookeeper</PackageTags>
-    <PackageReleaseNotes>1. fixed cache invalidation problem after used DynamicParameters for RequestContext.Request .</PackageReleaseNotes>
+    <PackageReleaseNotes>1. New support for [For Tag]</PackageReleaseNotes>
   </PropertyGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'net46' ">
     <PackageReference Include="Dapper" Version="1.50.2" />

SmartSql/SqlMap/Tags/For.cs

@@ -5,6 +5,8 @@
 using System.Text;
 using System.Text.RegularExpressions;
 using System.Linq;
+using SmartSql.Abstractions;
+
 namespace SmartSql.SqlMap.Tags
 {
     public class For : Tag