message: Fix minimum tokio-core version
diff: @@ -44,7 +44,7 @@ futures = "0.1.7"
  futures-state-stream = "0.2"
  postgres-protocol = { version = "0.3.0", path = "../postgres-protocol" }
  postgres-shared = { version = "0.4.0", path = "../postgres-shared" }
  -tokio-core = "0.1"
  +tokio-core = "0.1.8"
  tokio-dns-unofficial = "0.1"
  tokio-io = "0.1"
  