chore!: remove deprecated ParseMediaType (#352)

Signed-off-by: James Hillyerd <james@hillyerd.com>

header.go

@@ -12,7 +12,6 @@ import (
 	"github.com/jhillyerd/enmime/v2/internal/coding"
 	"github.com/jhillyerd/enmime/v2/internal/stringutil"
 	inttp "github.com/jhillyerd/enmime/v2/internal/textproto"
-	"github.com/jhillyerd/enmime/v2/mediatype"
 
 	"github.com/pkg/errors"
 )
@@ -101,26 +100,6 @@ func ParseAddressList(list string) ([]*mail.Address, error) {
 	return ret, nil
 }
 
-// Terminology from RFC 2047:
-//  encoded-word: the entire =?charset?encoding?encoded-text?= string
-//  charset: the character set portion of the encoded word
-//  encoding: the character encoding type used for the encoded-text
-//  encoded-text: the text we are decoding
-
-// ParseMediaType is a more tolerant implementation of Go's mime.ParseMediaType function.
-//
-// Tolerances accounted for:
-//   - Missing ';' between content-type and media parameters
-//   - Repeating media parameters
-//   - Unquoted values in media parameters containing 'tspecials' characters
-//
-// Deprecated: Use mediaType.Parse instead
-func ParseMediaType(ctype string) (mtype string, params map[string]string, invalidParams []string,
-	err error) {
-	// Export of internal function.
-	return mediatype.Parse(ctype)
-}
-
 // ReadHeader reads a block of SMTP or MIME headers and returns a
 // textproto.MIMEHeader. Header parse warnings & errors will be added to
 // ErrorCollector, io errors will be returned directly.

options_test.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"strings"
 	"testing"
+
+	"github.com/jhillyerd/enmime/v2/mediatype"
 )
 
 func TestSetCustomParseMediaType(t *testing.T) {
@@ -12,7 +14,7 @@ func TestSetCustomParseMediaType(t *testing.T) {
 	}
 	changeAndUtilizeDefault := func(ctype string) (mtype string, params map[string]string, invalidParams []string, err error) {
 		modifiedStr := strings.ReplaceAll(ctype, "application/Pamir Viewer", "application/PamirViewer")
-		return ParseMediaType(modifiedStr)
+		return mediatype.Parse(modifiedStr)
 	}
 	tcases := []struct {
 		ctype                string
@@ -57,7 +59,7 @@ func ExampleSetCustomParseMediaType() {
 	replaceSpecificContentType := func(ctype string) (mtype string, params map[string]string, invalidParams []string, err error) {
 		modifiedStr := strings.ReplaceAll(ctype, "application/Pamir Viewer", "application/PamirViewer")
 
-		return ParseMediaType(modifiedStr)
+		return mediatype.Parse(modifiedStr)
 	}
 
 	invalidMessageContent := `From: <enmime@parser.git>