chore: remove ioutil (#29)

generate.go

@@ -1,7 +1,6 @@
 package kroki
 
 import (
-	"io/ioutil"
 	"os"
 
 	"github.com/pkg/errors"
@@ -24,7 +23,7 @@ func (c *Client) FromString(input string, diagramType DiagramType, imageFormat I
 
 // FromFile takes a file path and returns the image generated by Kroki
 func (c *Client) FromFile(path string, diagramType DiagramType, imageFormat ImageFormat) (string, error) {
-	content, err := ioutil.ReadFile(path)
+	content, err := os.ReadFile(path)
 	if err != nil {
 		return "", errors.Wrapf(err, "fail to read file '%s'", path)
 	}

generate_test.go

@@ -2,9 +2,10 @@ package kroki
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
+	"os"
 	"strconv"
 	"strings"
 	"testing"
@@ -141,11 +142,11 @@ func TestFromLargeFile(t *testing.T) {
 			t.Errorf("FromLargeFile error\nexpectedBody: %s\nactual:   %s", expectedRequestMethod, method)
 		}
 		uri := strings.Split(r.RequestURI, "/")
-		body, err := ioutil.ReadAll(r.Body)
+		body, err := io.ReadAll(r.Body)
 		if err != nil {
 			t.Errorf("FromLargeFile unable to read body")
 		}
-		content, err := ioutil.ReadFile(file)
+		content, err := os.ReadFile(file)
 		if err != nil {
 			t.Errorf("FromLargeFile unable to read file: %s", file)
 		}
@@ -178,7 +179,6 @@ func TestFromLargeFile(t *testing.T) {
 	}
 }
 
-
 func TestWriteToFile(t *testing.T) {
 	client := New(Configuration{})
 	expected := "clojure"
@@ -187,7 +187,7 @@ func TestWriteToFile(t *testing.T) {
 	if err != nil {
 		t.Errorf("WriteToFile error:\n%+v", err)
 	}
-	content, err := ioutil.ReadFile(filePath)
+	content, err := os.ReadFile(filePath)
 	if err != nil {
 		t.Errorf("read file error:\n%+v", err)
 	}

http.go

@@ -3,7 +3,7 @@ package kroki
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"path"
@@ -46,7 +46,7 @@ func (c *Client) PostRequestContext(ctx context.Context, payload string, diagram
 	// read the result
 	defer response.Body.Close()
 	if response.StatusCode != http.StatusOK {
-		body, err := ioutil.ReadAll(response.Body)
+		body, err := io.ReadAll(response.Body)
 		var message string
 		if err != nil {
 			message = ""
@@ -57,7 +57,7 @@ func (c *Client) PostRequestContext(ctx context.Context, payload string, diagram
 			"fail to generate the image {status: %d, body: %s}",
 			response.StatusCode, message)
 	}
-	body, err := ioutil.ReadAll(response.Body)
+	body, err := io.ReadAll(response.Body)
 	if err != nil {
 		return "", errors.Wrap(err, "fail to read the response body")
 	}
@@ -104,7 +104,7 @@ func (c *Client) GetRequestContext(ctx context.Context, payload string, diagramT
 	// read the result
 	defer response.Body.Close()
 	if response.StatusCode != http.StatusOK {
-		body, err := ioutil.ReadAll(response.Body)
+		body, err := io.ReadAll(response.Body)
 		var message string
 		if err != nil {
 			message = ""
@@ -115,7 +115,7 @@ func (c *Client) GetRequestContext(ctx context.Context, payload string, diagramT
 			"fail to generate the image {status: %d, body: %s}",
 			response.StatusCode, message)
 	}
-	body, err := ioutil.ReadAll(response.Body)
+	body, err := io.ReadAll(response.Body)
 	if err != nil {
 		return "", errors.Wrap(err, "fail to read the response body")
 	}