[joss] degree_dist() is a misnomer

[szhorvat]

Nitpick: The degree_dist() method has a name that is perhaps not the best fit. What this function returns is not a distribution, but a list of degrees. In graph theory this is called a degree sequence, not a degree distribution. What is normally understood as a degree distribution is the fraction of times each degree appears in the degree sequence.

Ref https://github.com/openjournals/joss-reviews/issues/6016

[bonicim]

Good point. We will address this name in the next release.