Index Out Of Range in TextRankWithPOS

[huntrist]

In analyse/textrank.go
TextRankWithPOS function:
the line:

for j := i + 1; j < i+span && j <= len(pairs); j++

will cause an index out of range panic
when i = len(pairs) - 1 (the last element of the pairs)

change j <= len(pairs) to j < len(pairs) should fix it.