message: Update rand to 0.7
diff: @@ -9,7 +9,7 @@ license = "MIT/Apache-2.0"
  neqo-crypto = { path = "../neqo-crypto" }
  neqo-common = { path = "../neqo-common" }
  lazy_static = "1.0"
  -rand = "0.6"
  +rand = "0.7"
  log = "0.4.0"
  smallvec = "1.0.0"
  