Bump structopt from 0.3.20 to 0.3.21 (#950)

Cargo.lock

@@ -1131,9 +1131,9 @@ checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 
 [[package]]
 name = "structopt"
-version = "0.3.20"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "126d630294ec449fae0b16f964e35bf3c74f940da9dca17ee9b905f7b3112eb8"
+checksum = "5277acd7ee46e63e5168a80734c9f6ee81b1367a7d8772a2d765df2a3705d28c"
 dependencies = [
  "clap",
  "lazy_static",
@@ -1142,9 +1142,9 @@ dependencies = [
 
 [[package]]
 name = "structopt-derive"
-version = "0.4.13"
+version = "0.4.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "65e51c492f9e23a220534971ff5afc14037289de430e3c83f9daf6a1b6ae91e8"
+checksum = "5ba9cdfda491b814720b6b06e0cac513d922fc407582032e8706e9f137976f90"
 dependencies = [
  "heck",
  "proc-macro-error",

boa_cli/Cargo.toml

@@ -15,7 +15,7 @@ default-run = "boa"
 Boa = { path = "../boa", features = ["serde", "console"] }
 rustyline = "6.3.0"
 rustyline-derive = "0.3.1"
-structopt = "0.3.20"
+structopt = "0.3.21"
 serde_json = "1.0.59"
 colored = "2.0.0"
 regex = "1.4.2"

boa_tester/Cargo.toml

@@ -12,7 +12,7 @@ edition = "2018"
 
 [dependencies]
 Boa = { path = "../boa" }
-structopt = "0.3.20"
+structopt = "0.3.21"
 serde = { version = "1.0.117", features = ["derive"] }
 serde_yaml = "0.8.14"
 serde_json = "1.0.59"