Inconsistent notation in algorithm complexities

Hi,

When looking through the documentation for the Closeness and Betweenness
centrality measures, I noticed that they use an inconsistent notation.
The complexity of Betweenness is listed as: O(VE), while for Closeness it is
O(N(N+E)).
I'm presuming that N and V are both the number of nodes, if this is not the
case, then perhaps a clear definition of what N is might be useful, as I
don't see one.

In any case, thanks for the great package!

Best regards,
Sander

In both cases they refer to the number of nodes. Yes, it is
inconsistent, although I think it is easy to figure out from the
context. I will fix it.

Best,
Tiago