[Bug] example code transform1d.jl terminates with error

Running the example code `transform1d.jl` results in the error message 
`MethodError: no method matching wavelet(::Wavelets.WT.CDF{9, 7}, ::Wavelets.WT.FilterTransform) `
occurring for the line
```
wavelet(WT.cdf97, WT.Filter)
```