Update nitrokey-sys crate to 3.4.3

This change updates the nitrokey-sys crate to version 3.4.3.

Import subrepo nitrokey-sys/:nitrokey-sys at fe86df47853718983e1f45d6a4289a1d93ace45c

1 files changed, 15 insertions, 9 deletions

diff --git a/nitrokey-sys/README.md b/nitrokey-sys/README.md
index 9b4f654..343b7b5 100644
--- a/nitrokey-sys/README.md
+++ b/nitrokey-sys/README.md
@@ -3,17 +3,23 @@
 Low-level Rust bindings for `libnitrokey`, providing access to Nitrokey
 devices.
 
-```toml
-[dependencies]
-nitrokey-sys = "3.4.1"
-```
+This crate contains a copy of the [`libnitrokey`][] library, builds it from
+source and links it statically.  The host system must provide its dependencies
+in the library search path:
 
-The version of this crate corresponds to the wrapped `libnitrokey` version.
-This crate contains a copy of the `libnitrokey` library, builds it from source
-and links it statically.  The host system must provide its dependencies in the
-library search path:
+- `libhidapi-libusb0` (on Linux)
+- `libhidapi` (on non-Linux systems)
 
-- `libhidapi-libusb0`
+If you set the `USE_SYSTEM_LIBNITROKEY` environment variable when building this
+crate, it links directly against `libnitrokey` instead of building it from
+source.  In this case, `libnitrokey` must be available in the library search
+path.
+
+## Versioning
+
+The major and minor version of the `nitrokey-sys` crate map to the major and
+minor version of `libnitrokey`.  The `nitrokey-sys` patch version may be
+increased independently.
 
 ## Contact