message: Move approx to depenencies
diff: @@ -27,6 +27,7 @@ argmin_testfunctions = { git = "https://github.com/argmin-rs/argmin-testfunction
  rand = { version = "0.6.5", features = ["serde1"] }
  rand_xorshift = { version = "0.1.1", features = ["serde1"] }
  serde = { version = "1.0", features = ["derive", "rc"] }
  +approx = "0.3.2"
  # argmin_codegen = "0.1.8"
  # argmin_codegen = { path = "../argmin-codegen"}
  # argmin_codegen = { git = "https://github.com/argmin-rs/argmin-codegen.git", branch = "master"}
  @@ -36,7 +37,6 @@ ndarray = { version = "0.12.1", features = ["serde-1"] }
  ndarray-linalg = { version = "0.10.0", features = ["openblas"] }
  gnuplot = "0.0.27"
  paste = "0.1.5"
  -approx = "0.3.2"
  [features]
  default = []
  