diff --git a/.gitattributes b/.gitattributes
index 391f0a4..6313b56 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,2 +1 @@
-* text=auto
-*.js text eol=lf
+* text=auto eol=lf
diff --git a/.travis.yml b/.travis.yml
index 7d69d74..2ae9d62 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 language: node_js
 node_js:
+  - '10'
   - '8'
   - '6'
-  - '4'
diff --git a/index.js b/index.js
index 8696fd5..8a9b993 100644
--- a/index.js
+++ b/index.js
@@ -12,8 +12,6 @@ module.exports = (input, options) => {
 		return Promise.resolve(0);
 	}
 
-	// TODO: Remove below comment when new XO release is out
-	// eslint-disable-next-line no-unused-vars, unicorn/catch-error-name
 	return pify(zlib.gzip)(input, getOptions(options)).then(data => data.length).catch(_ => 0);
 };
 
@@ -55,7 +53,4 @@ module.exports.file = (path, options) => {
 	});
 };
 
-module.exports.fileSync = (path, options) => {
-	const data = fs.readFileSync(path);
-	return module.exports.sync(data, options);
-};
+module.exports.fileSync = (path, options) => module.exports.sync(fs.readFileSync(path), options);
diff --git a/package.json b/package.json
index 52e710b..fedd14a 100644
--- a/package.json
+++ b/package.json
@@ -1,40 +1,40 @@
 {
-  "name": "gzip-size",
-  "version": "4.1.0",
-  "description": "Get the gzipped size of a string or buffer",
-  "license": "MIT",
-  "repository": "sindresorhus/gzip-size",
-  "author": {
-    "name": "Sindre Sorhus",
-    "email": "sindresorhus@gmail.com",
-    "url": "sindresorhus.com"
-  },
-  "engines": {
-    "node": ">=4"
-  },
-  "scripts": {
-    "test": "xo && ava"
-  },
-  "files": [
-    "index.js"
-  ],
-  "keywords": [
-    "app",
-    "tool",
-    "zlib",
-    "gzip",
-    "compressed",
-    "size",
-    "string",
-    "buffer"
-  ],
-  "dependencies": {
-    "duplexer": "^0.1.1",
-    "pify": "^3.0.0"
-  },
-  "devDependencies": {
-    "ava": "*",
-    "p-event": "^1.3.0",
-    "xo": "*"
-  }
+	"name": "gzip-size",
+	"version": "4.1.0",
+	"description": "Get the gzipped size of a string or buffer",
+	"license": "MIT",
+	"repository": "sindresorhus/gzip-size",
+	"author": {
+		"name": "Sindre Sorhus",
+		"email": "sindresorhus@gmail.com",
+		"url": "sindresorhus.com"
+	},
+	"engines": {
+		"node": ">=6"
+	},
+	"scripts": {
+		"test": "xo && ava"
+	},
+	"files": [
+		"index.js"
+	],
+	"keywords": [
+		"app",
+		"tool",
+		"zlib",
+		"gzip",
+		"compressed",
+		"size",
+		"string",
+		"buffer"
+	],
+	"dependencies": {
+		"duplexer": "^0.1.1",
+		"pify": "^3.0.0"
+	},
+	"devDependencies": {
+		"ava": "*",
+		"p-event": "^2.1.0",
+		"xo": "*"
+	}
 }
diff --git a/test.js b/test.js
index 0ece1d9..5678b7e 100644
--- a/test.js
+++ b/test.js
@@ -42,8 +42,8 @@ test('passthrough', async t => {
 
 	const stream = fs.createReadStream('test.js')
 		.pipe(m.stream())
-		.on('data', buf => {
-			out += buf;
+		.on('data', buffer => {
+			out += buffer;
 		});
 
 	await pEvent(stream, 'end');