updating dependencies (#5028)

* updated docopt, env_logger, semver and regex crates

* updated parking_lot to 0.4

* fixed compiling on linux

* updated igd to 0.6

* updated jsonrpc

* fixed regex related compiler error on linux

util/network/Cargo.toml

@@ -16,9 +16,9 @@ tiny-keccak = "1.0"
 rust-crypto = "0.2.34"
 slab = "0.2"
 clippy = { version = "0.0.103", optional = true}
-igd = "0.5.0"
+igd = "0.6"
 libc = "0.2.7"
-parking_lot = "0.3"
+parking_lot = "0.4"
 ansi_term = "0.9"
 rustc-serialize = "0.3"
 ethcore-io = { path = "../io" }