Update to libnitrokey v3.6

This patch updates libnitrokey from version 3.5 to version 3.6, causing
these changes:

- New constants:
  - `NK_device_model_NK_LIBREM` (`NK_device_model` enum)
- New structures:
  - `NK_config`
- New functions:
  - `NK_device_serial_number_as_u32`
  - `NK_write_config_struct`
  - `NK_free_config`
  - `NK_read_config_struct`
  - `NK_free_password_safe_slot_status`
- Deprecated functions:
  - `NK_set_unencrypted_read_only`
  - `NK_set_unencrypted_read_write`

1 files changed, 166 insertions, 0 deletions

diff --git a/libnitrokey-v3.6/LICENSE b/libnitrokey-v3.6/LICENSE
new file mode 100644
index 0000000..341c30b
--- /dev/null
+++ b/libnitrokey-v3.6/LICENSE
@@ -0,0 +1,166 @@
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