message: Add a feature flag for nalgebra support
diff: @@ -23,6 +23,7 @@ bincode = "1.1.4"
  ctrlc = { version = "3.1.2", optional = true }
  gnuplot = { version = "0.0.37", optional = true}
  paste = "1.0.0"
  +nalgebra = { version = "0.21.1", optional = true, features = ["serde-serialize"] }
  ndarray = { version = "0.13", optional = true, features = ["serde-1"] }
  ndarray-linalg = { version = "0.12", optional = true }
  ndarray-rand = {version = "0.11.0", optional = true }
  @@ -45,6 +46,7 @@ argmin_testfunctions = "0.1.1"
  [features]
  default = []
  +nalgebral = ["nalgebra"]
  ndarrayl = ["ndarray", "ndarray-linalg", "ndarray-rand"]
  visualizer = ["gnuplot"]
  