fetch_last_solo_match/2 not guaranteed to return match from current season

[ecly]

Queries for last solo queue match seem to be able to return games from last season, causing us to show potentially wrong results for border. This occurs in fetch_last_solo_match/2 in riot.api.ex, and is a somewhat special case bug.

This is currently only a problem for us early in a season, as we require players to have a match history from which we can deduce their last played champions and/or their border. If they have a match history, and their last solo queue game was from the last season, we will get a rank indication from 2 seasons ago.

Potential fixes:

• Query API for season specific match
  • Requires some consistent way of getting current season id
  • (Riot currently has bug with bad season id's for matches making this inconsistent)

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