Fix the relevance parameter

[mledoze]

As @nvitucci noted in #37, the relevance parameter contains inaccurate data.

the strange thing is to have countries like Austria or Chile with a weight of 0 while small countries like Andorra or Isle of Man have a weight of 0.5

We should fix this to make this parameter more relevant.

[mledoze]

It's been almost a year now and I haven't found a way to fix this. By that I mean that I couldn't find any data to properly fill this property, so I'm thinking about removing it entirely.

[yackermann]

@mledoze Quite sad. Althou there really no data I could find too.