Added `Content-Disposition` header

package.json

 {
 	"name":    "@gviagroup/release-server-middleware",
-	"version": "1.0.0",
+	"version": "1.0.1",
 	
 	"main": "src/apis/index.js",
 	

src/apis/index.js

@@ -24,7 +24,9 @@ module.exports = function ({filesDir, tmpFilesDir} = {}) {
 			const filePath = await releasesModel.getReleaseFilePath({version: req.params.version});
 			if (!filePath) return null;
 			
+			const info = await releasesModel.getReleaseInfo({version: req.params.version});
 			req.url = path.relative(releasesModel.FILES_DIR, filePath);
+			res.set('Content-Disposition', `attachment; filename="${info.fileName}"`);
 			next();
 		});
 	const latestHandler = (req, res, next) => {

test/api/index.js

 'use strict';
 
+const fs = require('fs');
+
 const test     = require('ava');
 const axios    = require('axios');
+const del      = require('del');
 const FormData = require('form-data');
+const mkdirp   = require('mkdirp');
 
-const server = require('./_server');
+const releasesModel = require('../../src/models/releases')();
+const server        = require('./_server');
 
-test.serial.before(async () => {
+test.serial.before(async t => {
+	del.sync('/files/**', {dot: true, force: true});
+	mkdirp.sync(releasesModel.TMP_FILES_DIR);
+	
+	t.deepEqual(fs.readdirSync(releasesModel.FILES_DIR), ['.tmp']);
+	
 	await server.start();
 });
 
@@ -115,8 +125,12 @@ test.serial('Get release info', async t => {
 });
 
 test.serial('Download release', async t => {
-	const {data} = await axios.get('http://api/1.0.0');
-	t.is(data, 'Hello, World!');
+	const response = await axios.get('http://api/1.0.0');
+	
+	t.is(response.headers['content-disposition'], 'attachment; filename="release.txt"');
+	t.is(response.headers['content-length'],      '13');
+	
+	t.is(response.data, 'Hello, World!');
 });
 
 test.serial('Get latest release info', async t => {
@@ -128,8 +142,12 @@ test.serial('Get latest release info', async t => {
 });
 
 test.serial('Download latest release', async t => {
-	const {data} = await axios.get('http://api/latest');
-	t.is(data, 'Hello, World!');
+	const response = await axios.get('http://api/latest');
+	
+	t.is(response.headers['content-disposition'], 'attachment; filename="release.txt"');
+	t.is(response.headers['content-length'],      '13');
+	
+	t.is(response.data, 'Hello, World!');
 });
 
 test.serial('Get release info of invalid SemVer version', async t => {
@@ -242,6 +260,12 @@ test.serial.after.always(async () => {
 	await server.stop();
 });
 
+test.serial.after(async t => {
+	del.sync('/files/**', {dot: true, force: true});
+	
+	t.deepEqual(fs.readdirSync(releasesModel.FILES_DIR), []);
+});
+
 
 
 function getFormData({fileName}) {