Remove check for promise support

Signed-off-by: Matthew Peveler <[email protected]>

Author: MasterOdin

README.md

@@ -20,7 +20,7 @@ The `portfinder` module has a simple interface:
   });
 ```
 
-Or with promise (if `Promise`s are supported) :
+Or using promises:
 
 ``` js
   const portfinder = require('portfinder');
@@ -39,8 +39,6 @@ Or with promise (if `Promise`s are supported) :
     });
 ```
 
-If `portfinder.getPortPromise()` is called on a Node version without Promise (<4), it will throw an Error unless [Bluebird](http://bluebirdjs.com/docs/getting-started.html) or any Promise pollyfill is used.
-
 ### Ports search scope
 
 By default `portfinder` will start searching from `8000` and scan until maximum port number (`65535`) is reached.

lib/portfinder.js

@@ -226,10 +226,6 @@ exports.getPort = function (options, callback) {
 // Responds a promise to an unbound port on the current machine.
 //
 exports.getPortPromise = function (options) {
-  if (typeof Promise !== 'function') {
-    throw Error('Native promise support is not available in this version of node.' +
-      'Please install a polyfill and assign Promise to global.Promise before calling this method');
-  }
   if (!options) {
     options = {};
   }
@@ -280,10 +276,6 @@ exports.getPorts = function (count, options, callback) {
 // Responds with a promise that resolves to an array of unbound ports on the current machine.
 //
 exports.getPortsPromise = function (count, options) {
-  if (typeof Promise !== 'function') {
-    throw Error('Native promise support is not available in this version of node.' +
-      'Please install a polyfill and assign Promise to global.Promise before calling this method');
-  }
   if (!options) {
     options = {};
   }