message: unmark which as optional
diff: @@ -6,7 +6,7 @@ repository = "https://github.com/twistedfall/opencv-rust"
  readme = "README.md"
  keywords = [ "opencv", "vision" ]
  license = "MIT"
  -version = "0.27.0"
  +version = "0.27.1"
  edition = "2018"
  authors = ["Mathieu Poumeyrol <kali@zoy.org>", "Pro <twisted.fall@gmail.com>"]
  build = "build.rs"
  @@ -31,7 +31,7 @@ glob_crate = {package = "glob", version = "0.3"}
  once_cell = "1.0"
  rayon = "1.0"
  semver = "0.9"
  -which_crate = {package = "which", version = "3.0", optional = true, default-features = false}
  +which_crate = {package = "which", version = "3.0", default-features = false}
  [target.'cfg(not(target_env = "msvc"))'.build-dependencies]
  pkg-config = "0.3"
  @@ -44,7 +44,7 @@ matches = "0.1"
  [features]
  default = ["opencv-34"]
  -buildtime-bindgen = ["which_crate"]
  +buildtime-bindgen = []
  force-3rd-party-libs-discovery = []
  opencv-32 = []
  opencv-34 = []
  