Fixed using var instead of let in code to be backwards compatible

v1.1.1

1.1.1

Avoid returning NaN values when zero values are passed in

v1.1.0

1.1.0

Fixed determining significance for when challenger is worse than control

v1.0.5

1.0.5

v1.0.4

1.0.4

v1.0.3

1.0.3