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

ethkey/Cargo.toml

@@ -9,7 +9,7 @@ lazy_static = "0.2"
 tiny-keccak = "1.0"
 eth-secp256k1 = { git = "https://github.com/ethcore/rust-secp256k1" }
 rustc-serialize = "0.3"
-docopt = { version = "0.6", optional = true }
+docopt = { version = "0.7", optional = true }
 ethcore-bigint = { path = "../util/bigint" }
 rust-crypto = "0.2"
 byteorder = "1.0"