Fix CI failing

Signed-off-by: ErikQQY <[email protected]>

Author: ErikQQY

src/frft.jl

@@ -1,5 +1,3 @@
-using FFTW, DSP
-
 """
     frft(signal, α)
 
@@ -128,6 +126,4 @@ function sinc_interp(x, rate)
     h =  sinc.(collect(-(N-1-1/rate):1/rate:(N-1-1/rate)))
     out = conv(y, h)
     out = out[(rate*N-rate):(end-rate*N+rate+1)]
-end
-
-frft([2, 2, 2], 0.3)
+end