Update nitrokey dependency to 0.6.0

nitrokey 0.6.0 introduced the SerialNumber struct (instead of
representing serial numbers as strings). We no longer have to manually
format the serial number as SerialNumber implements Display.

1 files changed, 1 insertions, 1 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 68dbeaa..4ad53eb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -49,7 +49,7 @@ version = "0.4.0"
 version = "0.2"
 
 [dependencies.nitrokey]
-version = "0.5.1"
+version = "0.6"
 
 [dependencies.structopt]
 version = "0.3.7"