hive-tools update (user activity heatmap / market for dcity)

[hive-tools]

Today there are two updates for hive-tools.

1. a heatmap, that shows the activity of a given account for the last 7 days
   
2. more filter for the dCity market (SIM, SWAP.HIVE, DEC and animation) are added
   

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Here are a few example heatmaps generated with the new tool:

@exodegame	@splinterlands	@dcitygame
@elindos	@yabapmatt	@gerber

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