Added ffmpeg-static into package.json and remove it from README

Signed-off-by: Marcin Woźniak <y0rune@aol.com>

README.md

@@ -38,9 +38,6 @@ Emojis are already defined by default but you can modify them if you wish.
 
 In the console, type `npm install` to install all dependencies.
 
-For this bot to work, `ffmpeg` needs to be installed. You can download it [here](https://ffmpeg.org/download.html).
-If you are using Ubuntu you can simply run `sudo apt install ffmpeg`.
-
 To start the bot :
 
 ```

package.json

@@ -8,6 +8,7 @@
   "dependencies": {
     "@discordjs/opus": "^0.3.2",
     "discord-player": "^3.0.2",
-    "discord.js": "^12.2.0"
+    "discord.js": "^12.2.0",
+    "ffmpeg-static": "^4.2.7"
   }
 }