Enable additional compiler warnings

This patch enables the following compiler warnings:
- missing_docs for public symbols without documentation
- rust_2018_compatibility for Rust edition 2018 support
- rust_2018_idioms for Rust edition 2018 support
- unused for different types of unused code

1 files changed, 7 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
index e70aa73..2466117 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -84,6 +84,13 @@
 //! [`DeviceWrapper`]: enum.DeviceWrapper.html
 //! [`User`]: struct.User.html
 
+#![warn(
+    missing_docs,
+    rust_2018_compatibility,
+    rust_2018_idioms,
+    unused,
+)]
+
 extern crate libc;
 extern crate nitrokey_sys;
 extern crate rand;