Update structopt dependency to 0.3.21

This change updates the structopt crate to version 0.3.21. We need this
version as it fixes a compilation error [0] when using the
external_subcommand enum variant annotation provided by the crate with
certain versions of Rust.

[0]: https://github.com/TeXitoi/structopt/issues/447

3 files changed, 6 insertions, 5 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d6c7696..8782b38 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ Unreleased
 - Renamed the `--{no-,}{numlock,capslock,scrollock}` options of the `config
   set` command to `--{no-,}{num-lock,caps-lock,scroll-lock}`
 - Bumped `nitrokey` dependency to `0.8.0`
+- Bumped `structopt` dependency to `0.3.21`
 
 
 0.3.5
diff --git a/Cargo.lock b/Cargo.lock
index 6df9fe0..b1f8949 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -414,9 +414,9 @@ dependencies = [
 
 [[package]]
 name = "structopt"
-version = "0.3.17"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6cc388d94ffabf39b5ed5fadddc40147cb21e605f53db6f8f36a625d27489ac5"
+checksum = "5277acd7ee46e63e5168a80734c9f6ee81b1367a7d8772a2d765df2a3705d28c"
 dependencies = [
  "clap",
  "lazy_static",
@@ -425,9 +425,9 @@ dependencies = [
 
 [[package]]
 name = "structopt-derive"
-version = "0.4.10"
+version = "0.4.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5e2513111825077552a6751dfad9e11ce0fba07d7276a3943a037d7e93e64c5f"
+checksum = "5ba9cdfda491b814720b6b06e0cac513d922fc407582032e8706e9f137976f90"
 dependencies = [
  "heck",
  "proc-macro-error",
diff --git a/Cargo.toml b/Cargo.toml
index 0768177..a3771e7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -61,7 +61,7 @@ version = "1.0"
 features = ["derive"]
 
 [dependencies.structopt]
-version = "0.3.17"
+version = "0.3.21"
 default-features = false
 
 [dependencies.termion]