Add magnet support (#7)

* Add magnet support

Add torrent from magnet link
line 188-195

* Update index.js

import/export fix

lib/index.js

@@ -1,9 +1,9 @@
-import axios from 'axios'
-import * as stream from 'stream'
-import * as FormData from 'form-data'
+const stream = require('stream')
+const { default: axios } = require('axios')
+const FormData = require('form-data')
 const isNode = typeof stream !== 'undefined'
 
-export default class DelugeRPC {
+module.exports = class DelugeRPC {
   /**
    * @constructor
    * @param {string} delugeRpcBaseUrl deluge-web rpc url (without json)
@@ -185,11 +185,11 @@ export default class DelugeRPC {
     }
 
     // a URL
-    let isURL = false
+    let url = false
     try {
-      isURL = !!new URL(torrent)
+      url = new URL(torrent)
     } catch (e) {}
-    if (isURL) {
+    if (url && url.protocol !== 'magnet:') {
       torrent = await this.call('web.download_torrent_from_url', [torrent, config.cookie])
       delete config.cookie
     }