Fetch env_logger from github until 0.5.12 is available

Cargo.toml

@@ -70,7 +70,9 @@ untrusted = "0.5.1"
 bincode = "1.0.0"
 chrono = { version = "0.4.0", features = ["serde"] }
 log = "0.4.2"
-env_logger = "0.5.10"
+#TODO: Uncomment the next line and remove the [dependencies.env_logger]
+#      section below once env_logger 0.5.12 is published
+#env_logger = "0.5.12"
 matches = "0.1.6"
 byteorder = "1.2.1"
 libc = "0.2.1"
@@ -91,6 +93,11 @@ reqwest = "0.8.6"
 influx_db_client = "0.3.4"
 dirs = "1.0.2"
 
+# TODO: Remove this section once env_logger 0.5.12 is published
+[dependencies.env_logger]
+git = "https://github.com/sebasmagri/env_logger.git"
+rev = "a8da396c2e7ed912c9f926f9e7bb2c53e9e7aee0"
+
 [dev-dependencies]
 criterion = "0.2"