Update fast-xml-parser dependency (#35)

index.js

@@ -1,24 +1,25 @@
 'use strict';
-const parser = require('fast-xml-parser');
+const {XMLParser, XMLValidator} = require('fast-xml-parser');
 
 const isSvg = input => {
 	if (input === undefined || input === null) {
 		return false;
 	}
 
-	// TODO: Remove the `.replace` call when using `fast-xml-parser@4` which has fixed the bug.
-	input = input.toString().trim().replace(/\n/g, ' ');
+	input = input.toString().trim();
 
 	if (input.length === 0) {
 		return false;
 	}
 
 	// Has to be `!==` as it can also return an object with error info.
-	if (parser.validate(input) !== true) {
+	if (XMLValidator.validate(input) !== true) {
 		return false;
 	}
 
 	let jsonObject;
+	const parser = new XMLParser();
+
 	try {
 		jsonObject = parser.parse(input);
 	} catch (_) {

package.json

@@ -37,7 +37,7 @@
 		"buffer"
 	],
 	"dependencies": {
-		"fast-xml-parser": "^3.19.0"
+		"fast-xml-parser": "^4.1.3"
 	},
 	"devDependencies": {
 		"@types/node": "^11.13.0",