fix: WRDHYP was calculating the number of hypernymy paths for synsets #1
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… instead of the length of the paths
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In the paper, WRDHYP is described as a metric that computes "the average hypernym path length of all
synonym sets of a word". However, the implementation was instead using the length of synset.hypernym_paths(), which returns a list of different hypernym paths, therefore the implementation was using the number of hypernymy paths for synsets rather than their length. In this pull request I fixed it by taking the longest path a calculating its length, but you could also do an average or the shortest one.