GetPlayerSummaries adding %20 before first id

[felipecrrmts]

Example:
GetPlayerSummaries([]uint64{76561198110650343}, "realkey")

is becoming this request:

https://api.steampowered.com/ISteamUser/GetPlayerSummaries/v2/?key=realkey&steamids=%2076561198110650343

[felipecrrmts]

the problem is in this bit:

	var getPlayerSummaries = NewSteamMethod("ISteamUser", "GetPlayerSummaries", 2)
	strIds := make([]string, len(ids))
	for _, id := range ids {
		strIds = append(strIds, strconv.FormatUint(id, 10))
	}

should be:

	var getPlayerSummaries = NewSteamMethod("ISteamUser", "GetPlayerSummaries", 2)
	strIds := make([]string, len(ids))
	for i, id := range ids {
		strIds[i] = strconv.FormatUint(id, 10)
	}