- 增加 .Net Framework 4.0 的支持，出于环境考虑 .Net Framework 4.0 不支持异步方法；

- 增加 IFreeSql.Insert<T>(IEnumerable<T1> source) 方法；

FreeSql.DbContext/Repository/Repository/IBaseRepository.cs

@@ -29,7 +29,10 @@ namespace FreeSql
     {
         int Delete(Expression<Func<TEntity, bool>> predicate);
 
+#if net40
+#else
         Task<int> DeleteAsync(Expression<Func<TEntity, bool>> predicate);
+#endif
     }
 
     public interface IBaseRepository<TEntity, TKey> : IBaseRepository<TEntity>, IReadOnlyRepository<TEntity, TKey>, IBasicRepository<TEntity, TKey>