Update gifsicle dependency

index.js

@@ -3,13 +3,13 @@ const execa = require('execa');
 const gifsicle = require('gifsicle');
 const isGif = require('is-gif');
 
-module.exports = (options = {}) => input => {
+module.exports = (options = {}) => async input => {
 	if (!Buffer.isBuffer(input)) {
-		return Promise.reject(new TypeError(`Expected \`input\` to be of type \`Buffer\` but received type \`${typeof input}\``));
+		throw new TypeError(`Expected \`input\` to be of type \`Buffer\` but received type \`${typeof input}\``);
 	}
 
 	if (!isGif(input)) {
-		return Promise.resolve(input);
+		return input;
 	}
 
 	const args = ['--no-warnings', '--no-app-extensions'];
@@ -26,9 +26,10 @@ module.exports = (options = {}) => input => {
 		args.push(`--colors=${options.colors}`);
 	}
 
-	return execa(gifsicle, args, {
+	const {stdout} = await execa(gifsicle, args, {
 		encoding: null,
 		input
-	})
-		.then(({stdout}) => stdout);
+	});
+
+	return stdout;
 };

package.json

@@ -4,6 +4,7 @@
 	"description": "Imagemin plugin for Gifsicle",
 	"license": "MIT",
 	"repository": "imagemin/imagemin-gifsicle",
+	"funding": "https://github.com/imagemin/imagemin-gifsicle?sponsor=1",
 	"engines": {
 		"node": ">=6"
 	},
@@ -26,12 +27,12 @@
 	],
 	"dependencies": {
 		"execa": "^1.0.0",
-		"gifsicle": "^4.0.0",
+		"gifsicle": "^5.0.0",
 		"is-gif": "^3.0.0"
 	},
 	"devDependencies": {
 		"ava": "^0.25.0",
 		"pify": "^4.0.0",
-		"xo": "^0.23.0"
+		"xo": "^0.25.3"
 	}
 }