Updated Team to 2.4

[mattcan]

The latest version of the Team API allows a client
to request up to 10 summoners at a time. There is also the ability
to search for a team based on their TeamID or up to 10 Teams.

I've also added a function to create comma seperated strings
based on TeamIDs. This is very similar to createSummonerIDString
except that it takes a []string as an argument versus a []int64.

A test has been added for TeamByTeamID.

[TrevorSStone]

I appreciate you doing these. Good job. A minor thing is that you end up double checking the max length of the input teamIDs because you check it both inside and outside of createSummonerIDString. It's really not a huge deal but I figured I would point it out. Otherwise everything looks good to me.

Have you made any cool projects with the library yet? Would love to see them

[mattcan]

Thanks, I'm happy to help out!

For the createSummonerIDString method, I decided to do the double check because I wasn't quite prepared to making a change across a few files. Since the Team API only allows 10 summoners but Summoners and League (I think) allow 40 summoner lookups, do you think that we should move all the checks to be outside of createSummonerIDString or change the method interface to be something like

func createSummonerIDString( summonerID []int64, summonerLimit int ) (summonerIDstr string, err error) {}

Doing that keeps the check internal but also makes clear how many are allowed.

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With the new Match API becoming available, I'm revitalizing a project I started a few months ago called Coach Of Legends. It is meant to provide analysis for players based on how they play and how others at their level or higher play. Hopefully I'll finish one day.. haha