Provide access to historical json files

[jay3686]

I'd like it if this repo stored the historical json files with slightly more metadata.

The current use case I'm considering is to build a json api on top of these files to, for example, filter and return all changes to a character throughout patches.

If the json file format was changed slightly to have some top level data (patch #, release date)
we could build an even more useful api that could look at a historical replay, and show you the specific skills / multipliers a hero had at the time of the replay.

I saw the closed issue that is somewhat relevant. (#26)

I understand that historical data will be generally hard to reproduce, and that's ok. I still think it would be something useful to have going forward.

[jnovack]

The structure was created before I started the project. I will not change it at this time.