added checks for sql null types

cmd/main.go

@@ -1,13 +1,19 @@
 package main
 
 import (
+	"database/sql"
 	"fmt"
+	"time"
 
 	"code.jakeyoungdev.com/go/lazy"
 )
 
 func main() {
 
+	type Test struct {
+		Timer    sql.NullTime `db:"timer"`
+		TestTime time.Time    `db:"times"`
+	}
 	// res, err := lazy.RandomStruct(lazy.StructConfig{
 	// 	Query:    "insert into test (one, two) values (?, ?), (?, ?)",
 	// 	Example:  test{},
@@ -16,7 +22,7 @@ func main() {
 
 	x, y := lazy.RandomGenerate(lazy.Config{
 		Query:    "select * from table",
-		Example:  lazy.Test{},
+		Example:  Test{},
 		RowCount: 1,
 	})
 	if y != nil {