Add MIMETypePNG

s3/s3.go

@@ -54,6 +54,9 @@ const (
 	// MIMETypeImage defines the constant for the Image MIME type.
 	MIMETypeImage MIMEType = "image/*"
 
+	// MIMETypePNG defines the constant for the PNG MIME type.
+	MIMETypePNG MIMEType = "image/png"
+
 	// MIMETypeDefault defines the constant for the default MIME type.
 	MIMETypeDefault MIMEType = "application/octet-stream"