Upgrade logging dependencies

Author: faern

core/Cargo.toml

@@ -13,7 +13,7 @@ license = "MIT/Apache-2.0"
 error-chain = "0.11"
 futures = "0.1"
 jsonrpc-core = "8.0"
-log = "0.3"
+log = "0.4"
 serde = "1.0"
 serde_json = "1.0"
 

http/Cargo.toml

@@ -15,7 +15,7 @@ futures = "0.1.15"
 hyper = "0.11"
 hyper-tls = { version = "0.1", optional = true }
 native-tls = { version = "0.1", optional = true }
-log = "0.3"
+log = "0.4"
 tokio-core = "0.1"
 
 jsonrpc-client-core = { version = "0.2.1", path = "../core" }
@@ -25,7 +25,7 @@ default = ["tls"]
 tls = ["hyper-tls", "native-tls"]
 
 [dev-dependencies]
-env_logger = "0.4"
+env_logger = "0.5"
 jsonrpc-core = "8.0"
 jsonrpc-macros = "8.0"
 jsonrpc-http-server = "8.0"