Update nitrokey crate to 0.4.0

This change finally updates the version of the nitrokey crate that we
consume to 0.4.0. Along with that we update rand_core, one of its
dependencies, to 0.5.1. Further more we add cfg-if in version 0.1.10 and
getrandom in version 0.1.13, both of which are now new (non-development)
dependencies.

Import subrepo nitrokey/:nitrokey at e81057037e9b4f370b64c0a030a725bc6bdfb870
Import subrepo cfg-if/:cfg-if at 4484a6faf816ff8058088ad857b0c6bb2f4b02b2
Import subrepo getrandom/:getrandom at d661aa7e1b8cc80b47dabe3d2135b3b47d2858af
Import subrepo rand/:rand at d877ed528248b52d947e0484364a4e1ae59ca502

2 files changed, 145 insertions, 0 deletions

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diff --git a/nitrokey/LICENSES/MIT.txt b/nitrokey/LICENSES/MIT.txt
new file mode 100644
index 0000000..6c67cd5
--- /dev/null
+++ b/nitrokey/LICENSES/MIT.txt
@@ -0,0 +1,24 @@
+Valid-License-Identifier: MIT
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