all: adding dotenv to all binary crates

mixnode/Cargo.toml

@@ -11,6 +11,7 @@ edition = "2018"
 base64 = "0.11.0"
 clap = "2.33.0"
 curve25519-dalek = "1.2.3"
+dotenv = "0.15.0"
 futures = "0.3.1"
 log = "0.4"
 pretty_env_logger = "0.3"

mixnode/src/main.rs

@@ -6,6 +6,7 @@ mod mix_peer;
 mod node;
 
 fn main() {
+    dotenv::dotenv().ok();
     pretty_env_logger::init();
 
     let arg_matches = App::new("Nym Mixnode")