cargo update and rayon 1.3.1 -> 1.4.0

Cargo.lock

@@ -1069,9 +1069,9 @@ checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 
 [[package]]
 name = "syn"
-version = "1.0.40"
+version = "1.0.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "963f7d3cc59b59b9325165add223142bbf1df27655d07789f109896d353d8350"
+checksum = "6690e3e9f692504b941dc6c3b188fd28df054f7fb8469ab40680df52fdcc842b"
 dependencies = [
  "proc-macro2",
  "quote",

Cargo.toml

@@ -19,7 +19,7 @@ rmp-serde = "0.14.4"
 nix = "0.18.0"
 serde = { version = "1.0.115", features = ["derive"] }
 base64 = "0.12.3"
-rayon = "1.3.1"
+rayon = "1.4.0"
 serde_json = "1.0.57"
 
 [profile.release]