don't actually need DSP directly

Author: dsweber2

Project.toml

@@ -5,7 +5,6 @@ version = "1.1.5"
 
 [deps]
 AbstractFFTs = "621f4979-c628-5d54-868e-fcf4e3e8185c"
-DSP = "717857b8-e6f2-59f4-9121-6e50c889abd2"
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 FFTW = "7a1cc6ca-52ef-59f5-83cd-3a7055c09341"
 Interpolations = "a98d9a8b-a2ab-59e6-89dd-64a1c18fca59"