Update Rust crate serde to 1.0.194

Cargo.toml

@@ -14,7 +14,7 @@ categories=["development-tools"]
 
 [dependencies]
 reqwest = "0.9.0"                                       # http requests
-serde = {version = "1.0.111", features = ["derive"]}    # serialization
+serde = {version = "1.0.194", features = ["derive"]}    # serialization
 serde_json = "1.0.53"                                   # serialize JSON 
 clap = "2.33.1"                                         # argument parsing
 colored = "1.9"                                         # color in terminal