update prices idea: filter sellers by reputation

[GrumlyHS]

Hi,

that's a great work you made.
If i may, can i suggest something to improve the update prices module :

There should be an option to select the seller minimum level when we get similar items. I think it's good to ignore bad sellers in calculation.

From MKM API :

minUserScore (query parameter)
only articles from sellers with the sepcified user score or better are returned (1 for outstanding > 2 for very good > 3 good > 4 for average > 5 for bad)
Type: int (with values as stated above)
Optional

best regards