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

1 files changed, 21 insertions, 0 deletions

diff --git a/rand/rand_distr/CHANGELOG.md b/rand/rand_distr/CHANGELOG.md
new file mode 100644
index 0000000..376bb95
--- /dev/null
+++ b/rand/rand_distr/CHANGELOG.md
@@ -0,0 +1,21 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.2.1] - 2019-06-29
+- Update dependency to support Rand 0.7
+- Doc link fixes
+
+## [0.2.0] - 2019-06-06
+- Remove `new` constructors for zero-sized types
+- Add Pert distribution
+- Fix undefined behavior in `Poisson`
+- Make all distributions return `Result`s instead of panicking
+- Implement `f32` support for most distributions
+- Rename `UnitSphereSurface` to `UnitSphere`
+- Implement `UnitBall` and `UnitDisc`
+
+## [0.1.0] - 2019-06-06
+Initial release. This is equivalent to the code in `rand` 0.6.5.