lib.rs: warnings missing docs, 2018 compliance

- enable project wide compiler warnings
- update documentation strings

Signed-off-by: Ralf Zerres <ralf.zerres@networkx.de>

src/lib.rs

@@ -5,19 +5,17 @@
  * SPDX-License-Identifier: 0BSD, MIT
  */
 
-//#[macro_use]
+#![warn(missing_docs, rust_2018_idioms, rust_2018_compatibility)]
-//extern crate diesel;
 
-//pub mod db;
+//! advotrackerd: crate documentation
 
 // This function adds two integers (given as arguments) and returns the sum.
 //
 // # Examples
 //
 // ```
-// assert_eq!(8, advotracker_backend::internal_adder(4, 4));
+// assert_eq!(8, advotrackerd::internal_adder(4, 4));
 // ```
-
 fn internal_adder(a: i32, b: i32) -> i32 {
    a + b
 }
@@ -27,13 +25,13 @@ fn internal_adder(a: i32, b: i32) -> i32 {
 /// # Examples
 ///
 /// ```
-/// assert_eq!(4, advotracker_backend::add_two(2));
+/// assert_eq!(4, advotrackerd::add_two(2));
 /// ```
-
 pub fn add_two(a: i32) -> i32 {
     internal_adder(a, 2)
 }
 
+
 #[cfg(test)]
 mod tests {
     use super::*;