Quality of life change: Make it so you can change summoner spells once before leaving base.

We already know that Riot has the ability to let you permanently change summoners in game (old spell book) so why don't we add a change where you can change one summoner spell once the game starts and only while your in base. you only get one change per game and it won't work once you leave fountain. The idea behind the change would be to allow people who may have forgotten to change summoners from previous games to do so, so instead of a jungler with no smite they are able to get smite. and so on