message: Fix CI build.
  Quickcheck pushed an update incompatible with Rust 1.26.0, so exclude that version for now.
diff: @@ -37,7 +37,7 @@ libc = ">=0.1.5"
  [dev-dependencies]
  tempdir = "0.3.7"
  approx = "0.3"
  -quickcheck = { version = "0.8", default-features = false }
  +quickcheck = { version = "0.8, <0.8.3", default-features = false }
  rand = "0.6"
  [badges]
  