Specify version for all crates in Cargo.toml

Cargo.toml

@@ -32,8 +32,8 @@ staticfile = "0.4"
 serde_derive = "1.0"
 handlebars-iron = "0.25.1"
 iron-sessionstorage = "*"
-serde_yaml = "*"
-structopt = "*"
+serde_yaml = "0.8.9"
+structopt = "0.2.18"
 reqwest = "0.6.2"
 linked-hash-map = "0.5.1"
 bcrypt = "0.3"