level: level of summoner
matchId: de-identified identification number for match
winner: flag indicating whether or not the team won
kill: number of kills
death: number of deaths
assist: number of kills
timeCreated: match creation time (UTC-05 for N. Amer, UTC-00 for EUW)
duration: match duration (seconds)
matchType: match type
numOfRunes: number of runes
numOfMasteries: number of masteries
isBot: Flag indicating whether or not the player is a bot