chore: remove refs to deprecated io/ioutil (#116)

Author: testwill

json.go

@@ -6,7 +6,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 )
 
 type jsonPDFGenerator struct {
@@ -45,7 +44,7 @@ func (pdfg *PDFGenerator) ToJSON() ([]byte, error) {
 			jp.PageOptions = tp.PageOptions
 		}
 		if p.Reader() != nil {
-			buf, err := ioutil.ReadAll(p.Reader())
+			buf, err := io.ReadAll(p.Reader())
 			if err != nil {
 				return nil, err
 			}

json_test.go

@@ -3,7 +3,7 @@ package wkhtmltopdf
 import (
 	"bytes"
 	"encoding/json"
-	"io/ioutil"
+	"io"
 	"os"
 	"reflect"
 	"testing"
@@ -62,7 +62,7 @@ func TestNewPDFGeneratorFromJSON(t *testing.T) {
 func TestNewPDFGeneratorFromJSONWithReader(t *testing.T) {
 
 	pdfg := NewPDFPreparer()
-	htmlfile, err := ioutil.ReadFile("testdata/htmlsimple.html")
+	htmlfile, err := os.ReadFile("testdata/htmlsimple.html")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -84,7 +84,7 @@ func TestNewPDFGeneratorFromJSONWithReader(t *testing.T) {
 	}
 
 	// assert content
-	buf, err := ioutil.ReadAll(pdfgFromJSON.pages[0].Reader())
+	buf, err := io.ReadAll(pdfgFromJSON.pages[0].Reader())
 	if err != nil {
 		t.Fatal(err)
 	}

wkhtmltopdf_test.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"context"
 	"errors"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -214,7 +213,7 @@ func TestPDFGeneratorOutputFile(t *testing.T) {
 func TestGeneratePdfFromStdinHtml5(t *testing.T) {
 	//Use newTestPDFGenerator and append to page1 and TOC
 	pdfg := newTestPDFGenerator(t)
-	htmlfile, err := ioutil.ReadFile("testdata/html5.html")
+	htmlfile, err := os.ReadFile("testdata/html5.html")
 	if err != nil {
 		t.Fatal(err)
 	}