Fixed failing test (which was failing in master). walk_test now returns 25 items in the walk rather than 21, presumably due to adding of S2 cells in https://github.com/googleinterns/cabby/pull/72
Fixed failing test (which was failing in master). walk_test now returns 25 items in the walk rather than 21, presumably due to adding of S2 cells in https://github.com/googleinterns/cabby/pull/72

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