Update CodeFirst pgsql

Src/Asp.Net/SqlSugar/Realization/PostgreSQL/CodeFirst/PostgreSQLCodeFirst.cs

@@ -20,6 +20,7 @@ namespace SqlSugar
                     columns.Add(dbColumnInfo);
                 }
             }
+            columns = columns.OrderBy(it => it.IsPrimarykey ? 0 : 1).ToList();
             this.Context.DbMaintenance.CreateTable(tableName, columns,true);
         }
         protected override DbColumnInfo EntityColumnToDbColumn(EntityInfo entityInfo, string tableName, EntityColumnInfo item)