Bug in module Roots fixed

[Jan Skibinski]

        I discovered and fixed a bug in my module Roots.html
        (http://www.numeric-quest.com/haskell/)

        Function "roots" was failing on certain sequencies, such
        as [1,1,1,1,1,1] (but not [1,1,1,1,1,1,1], etc.) due to 
        division by zero in some circumstances.

        This is a quick fix, but I hope it works for a time being.
        Sorry for your inconvenience.

        Jan