Update to v2.4.0

[Chris Watson]

Hello, yesterday I updated the package to v2.4.0. There are a couple new features (which you can always see in NEWS.md on Github):

* "hubness" is a new function that is used to calculate a vertex's "hubness"; see van den Heuvel (2010) for details. This function is now used to calculate the "num.hubs" attribute by "set_brainGraph_attrs" instead of basing it on betweenness centrality.

* "set_brainGraph_attrs" has a new argument called "clust.method". This lets you choose a clustering (community detection) algorithm different from Louvain, which was the previous default. See the documentation for that function, and also the User Guide in Chapter 5.3.

* A very minor change, but one that *could* affect users, is that the "density" graph attribute assigned by "set_brainGraph_attrs" is no longer rounded.

As always, let me know if you have any issues.

Chris

[Sean Ma]

Thanks for the update! 

Sean