Add openBoosterPack

[itsjfx]

Add openBoosterPack - implemented in the same way as getGemValue and turnItemIntoGems.

Errors just like getGemValue and turnItemIntoGems by checking the success state, if successful Steam responds with an array with info on the opened cards in this format - this response is the response callback for the function:

[
	{
		image: 'https://steamcommunity-a.akamaihd.net/economy/image/IzMF03bk9WpSBq-S-ekoE33L-iLqGFHVaU25ZzQNQcXdA3g5gMEPvUZZEfSMJ6dESN8p_2SVTY7V2NoNxXEKmChCIzb02ClYd_Z5K43PzQT8pL-LSiLyMGGXe3KPGgo6ROdZY2HY-mCi4u3FQ2rMQ-4rFlwBK6BX9mFLI4nXaARvi8VfrneHnkl8GRN1J8ERJwnjmHFANO10zSARJpJUnHfydJ2PjFxmbhJpXr-yV7rDbNP3wTFkA01xWa0bIIswqRk',
		name: 'Ursus',
		series: 1,
		foil: false
	},
	{
		image: 'https://steamcommunity-a.akamaihd.net/economy/image/IzMF03bk9WpSBq-S-ekoE33L-iLqGFHVaU25ZzQNQcXdA3g5gMEPvUZZEfSMJ6dESN8p_2SVTY7V2NoNxXEKmChCIzb02ClDYPxhOdmAyQj6pufQTXWmPzaSfHCPH1o4S7FaYWvZ_zWk4-vGQm6dE-l-EQEEdPBXp2dPNNfJYUUrhthJr2CqqE1wHxEtL5BCJ1i9kiYWYrh1mSQTJshbnyGjJMbQ01ZhbEA-WbzgA73EboL3wn46HUQwCeYXZQ7oK0XY',
		name: 'Neymar',
		series: 1,
		foil: false
	},
	{
		image: 'https://steamcommunity-a.akamaihd.net/economy/image/IzMF03bk9WpSBq-S-ekoE33L-iLqGFHVaU25ZzQNQcXdA3g5gMEPvUZZEfSMJ6dESN8p_2SVTY7V2NoNxXEKmChCIzb02ClDYPxhOdmAyQj6pufQTXWmPzaSfHCPH1o4S7FaYWvZ_zWk4-vGQm6dE-l-EQEEdPBXp2dPNNfJYUUrhthJr2CqqE1wHxEtL5BCJ1i9kiYWYrh1mSQTJshbnyGjJMbQ01ZhbEA-WbzgA73EboL3wn46HUQwCeYXZQ7oK0XY',
		name: 'Neymar',
		series: 1,
		foil: false
	}
]

The doc would read something like this:

openBoosterPack(appid, assetid, callback)

• appid - The AppID of the game to which the booster pack in question belongs
• assetid - The AssetID of the booster pack in question
• callback - A function to be called when the request completes
  • err - An Error object on failure, or null on success
  • res - An array containing information on the opened cards.

v or later is required to use this method

Open a booster pack.

[itsjfx]

Also a solution for this issue: #247

[DoctorMcKay]

👍 Thanks a bunch