Update dependencies (#7)

Author: amacneil

index.js

@@ -6,7 +6,7 @@ var log = debug('fetch-test-server');
 
 function TestServer(app) {
   if (!(this instanceof TestServer)) {
-    return new TestServer;
+    return new TestServer();
   }
 
   this.server = http.createServer(app);

index.test.js

@@ -20,6 +20,10 @@ describe('TestServer', () => {
     server = new TestServer(app);
   });
 
+  afterEach(() => {
+    return server.listener ? server.close() : null;
+  });
+
   it('creates an http server', () => {
     assert.typeOf(server.server, 'object');
   });

package.json

@@ -29,14 +29,14 @@
     "testing"
   ],
   "dependencies": {
-    "debug": "^2.2.0",
-    "node-fetch": "^1.5.1"
+    "debug": "^3.1.0",
+    "node-fetch": "^2.1.2"
   },
   "devDependencies": {
-    "chai": "3.5.0",
-    "eslint": "2.8.0",
-    "eslint-config-airbnb-base": "1.0.4",
-    "eslint-plugin-import": "1.6.0",
-    "mocha": "2.4.5"
+    "chai": "^4.1.2",
+    "eslint": "^4.19.1",
+    "eslint-config-airbnb-base": "^12.1.0",
+    "eslint-plugin-import": "^2.11.0",
+    "mocha": "^5.1.1"
   }
 }