upgrade, and refactor imports

Cargo.toml

@@ -12,8 +12,8 @@ categories = ["command-line-utilities"]
 
 [dependencies]
 structopt = "0.3.26"
-serde = {version = "1.0.197", features = ["derive"]}
-serde_json = "1.0.114"
-ureq = {version = "2.9.6", features = ["json"]}
+serde = {version = "1.0.208", features = ["derive"]}
+serde_json = "1.0.125"
+ureq = {version = "2.10.1", features = ["json"]}
 billboard = "0.2"
 directories = "5.0.1"