ArgumentError "VpiHigh" is not a valid VPI property

[Suraj N. Kurapati]

Mikhail Ravkine wrote:
> It can be solved by editing "counter_design.rb" and changing all
> instances of "High!" to "t!" and "Low!" to "f!"

You are correct; thanks for posting this solution.  I must have
forgotten to update the examples properly after I the deprecated
high! and low! methods in favor of the t! and f! methods.

I will make a new release this week containing your solution.

Cheers.