refactor(deployer): Class syntax

lib/extend/deployer.js

@@ -2,29 +2,31 @@
 
 const Promise = require('bluebird');
 
-function Deployer() {
-  this.store = {};
-}
+class Deployer {
+  constructor() {
+    this.store = {};
+  }
 
-Deployer.prototype.list = function() {
-  return this.store;
-};
+  list() {
+    return this.store;
+  }
 
-Deployer.prototype.get = function(name) {
-  return this.store[name];
-};
+  get(name) {
+    return this.store[name];
+  }
 
-Deployer.prototype.register = function(name, fn) {
-  if (!name) throw new TypeError('name is required');
-  if (typeof fn !== 'function') throw new TypeError('fn must be a function');
+  register(name, fn) {
+    if (!name) throw new TypeError('name is required');
+    if (typeof fn !== 'function') throw new TypeError('fn must be a function');
 
-  if (fn.length > 1) {
-    fn = Promise.promisify(fn);
-  } else {
-    fn = Promise.method(fn);
-  }
+    if (fn.length > 1) {
+      fn = Promise.promisify(fn);
+    } else {
+      fn = Promise.method(fn);
+    }
 
-  this.store[name] = fn;
-};
+    this.store[name] = fn;
+  }
+}
 
 module.exports = Deployer;