refactor!: finish parser migration

Finally! :)

This removes all code related to the old parser.

#65

lib/Innertube.js

@@ -19,6 +19,7 @@ const NotificationsMenu = require('./parser/youtube/NotificationsMenu');
 const YTMusic = require('./core/Music');
 const FilterableFeed = require('./core/FilterableFeed');
 const TabbedFeed = require('./core/TabbedFeed');
+const Feed = require('./core/Feed');
 
 const EventEmitter = require('events');
 const { PassThrough } = BROWSER ? require('stream-browserify') : require('stream');
@@ -32,7 +33,6 @@ const {
   generateRandomString
 } = require('./utils/Utils');
 
-const OldParser = require('./parser');
 const Proto = require('./proto');
 
 /** @namespace */
@@ -51,7 +51,7 @@ class Innertube {
    * @param {string} [config.cookie]
    * @param {boolean} [config.debug]
    * @param {object} [config.proxy]
-   * @param {object} [config.http_ent]
+   * @param {object} [config.http_agent]
    * @param {object} [config.https_agent]
    */
   constructor(config) {
@@ -107,7 +107,6 @@ class Innertube {
 
   /**
    * Signs in to a google account.
-   *
    * @param {object} credentials
    * @param {string} credentials.access_token - Token used to sign in.
    * @param {string} credentials.refresh_token - Token used to get a new access token.
@@ -133,7 +132,6 @@ class Innertube {
 
   /**
    * Signs out of an account.
-   *
    * @returns {Promise.<{ success: boolean, status_code: number }>}
    */
   async signOut() {
@@ -148,7 +146,6 @@ class Innertube {
 
   /**
    * Retrieves video info.
-   *
    * @param {string} video_id
    * @returns {Promise.<VideoInfo>}
    */
@@ -165,7 +162,6 @@ class Innertube {
 
   /**
    * Retrieves basic video info.
-   *
    * @param {string} video_id
    * @returns {Promise.<VideoInfo>}
    */
@@ -179,7 +175,6 @@ class Innertube {
 
   /**
    * Searches a given query.
-   *
    * @param {string} query - search query.
    * @param {object} [filters] - search filters.
    * @param {string} [filters.upload_date] - filter videos by upload date, can be: any | last_hour | today | this_week | this_month | this_year
@@ -224,7 +219,6 @@ class Innertube {
 
   /**
    * Retrieves comments for a video.
-   *
    * @param {string} video_id - the video id.
    * @param {string} [sort_by] - can be: `TOP_COMMENTS` or `NEWEST_FIRST`.
    * @returns {Promise.<Comments>}
@@ -243,7 +237,6 @@ class Innertube {
 
   /**
    * Retrieves YouTube's home feed (aka recommendations).
-   *
    * @returns {Promise<FilterableFeed>}
    */
   async getHomeFeed() {
@@ -253,7 +246,6 @@ class Innertube {
 
   /**
    * Returns the account's library.
-   *
    * @returns {Promise.<Library>}
    */
   async getLibrary() {
@@ -263,8 +255,7 @@ class Innertube {
 
   /**
    * Retrieves watch history.
-   * Which can also be achieved through {@link getLibrary()}.
-   *
+   * Which can also be achieved with {@link getLibrary()}.
    * @returns {Promise.<History>}
    */
   async getHistory() {
@@ -274,7 +265,6 @@ class Innertube {
 
   /**
    * Retrieves trending content.
-   *
    * @returns {Promise<TabbedFeed>}
    */
   async getTrending() {
@@ -284,23 +274,15 @@ class Innertube {
 
   /**
    * Retrieves subscriptions feed.
-   *
-   * @returns {Promise.<{ items: Array.<{ date: string, videos: object[] }>}>}
+   * @returns {Promise.<Feed>}
    */
   async getSubscriptionsFeed() {
     const response = await this.actions.browse('FEsubscriptions');
-
-    const subsfeed = new OldParser(this, response, {
-      client: 'YOUTUBE',
-      data_type: 'SUBSFEED'
-    }).parse();
-
-    return subsfeed;
+    return new Feed(this.actions, response.data);
   }
 
   /**
-   * Retrieves contents for a given channel. (WIP)
-   *
+   * Retrieves contents for a given channel.
    * @param {string} id - channel id
    * @returns {Promise<Channel>}
    */
@@ -312,7 +294,6 @@ class Innertube {
 
   /**
    * Retrieves notifications.
-   *
    * @returns {Promise.<NotificationsMenu>}
    */
   async getNotifications() {
@@ -322,7 +303,6 @@ class Innertube {
 
   /**
    * Retrieves unseen notifications count.
-   *
    * @returns {Promise.<number>}
    */
   async getUnseenNotificationsCount() {
@@ -332,7 +312,6 @@ class Innertube {
 
   /**
    * Retrieves the contents of a given playlist.
-   *
    * @param {string} playlist_id - the id of the playlist.
    * @returns {Promise.<Playlist>}
    */