removed BenchmarkTools dependency

Author: j-fu

Project.toml

@@ -4,7 +4,6 @@ authors = ["Juergen Fuhrmann <juergen.fuhrmann@wias-berlin.de>"]
 version = "0.1.3"
 
 [deps]
-BenchmarkTools = "6e4b80f9-dd63-53aa-95a3-0cdb28fa8baf"
 DocStringExtensions = "ffbed154-4ef7-542d-bbb7-c09d3a79fcae"
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"