Switch to "interval_tree"
Legitbot needs to quickly determine if an IP belongs to a set of ranges, because that's how Facebook returns its valid IPs. Issue #10 uncovered a bug in "segment_tree" library Legitbot was using to make this lookup. The most practical way of resolving the issue turned out to switch to another library "interval_tree".
Since the public API of Legitbot did not change, only the minor version number was incremented.