Bump serde from 1.0.138 to 1.0.139 (#8)

Cargo.lock

@@ -694,18 +694,18 @@ dependencies = [
 
 [[package]]
 name = "serde"
-version = "1.0.138"
+version = "1.0.139"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1578c6245786b9d168c5447eeacfb96856573ca56c9d68fdcf394be134882a47"
+checksum = "0171ebb889e45aa68b44aee0859b3eede84c6f5f5c228e6f140c0b2a0a46cad6"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.138"
+version = "1.0.139"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "023e9b1467aef8a10fb88f25611870ada9800ef7e22afce356bb0d2387b6f27c"
+checksum = "dc1d3230c1de7932af58ad8ffbe1d784bd55efd5a9d84ac24f69c72d83543dfb"
 dependencies = [
  "proc-macro2",
  "quote",

Cargo.toml

@@ -18,7 +18,7 @@ gio = { version = "0.15.12", features = ["v2_72"] }
 gdk = "0.15.4"
 gdk-pixbuf = "0.15.11"
 glib = "0.15.12"
-serde = { version = "1.0.137", features = ["derive"] }
+serde = { version = "1.0.139", features = ["derive"] }
 serde_json = "1.0.81"
 
 [profile.release]