Update README to reflect versioning changes

To be able to ship crate updates without a new libnitrokey version, the
patch version is decoupled from libnitrokey.  This patch updates the
README to describe this policy.

1 files changed, 10 insertions, 9 deletions

diff --git a/README.md b/README.md
index 9b4f654..94cbc1e 100644
--- a/README.md
+++ b/README.md
@@ -3,17 +3,18 @@
 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`
+## 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