Fixed accidental committed move and fixed unused functions warnings

The accidental commit took place in
3558a4869a. Modules were not declared public which caused warnings in these modules

src/main.rs

@@ -2,8 +2,8 @@
 //! 
 //! `footswitch-rs` enables you to use footswitches of <xxx>
 //! 
-mod key_operations;
-mod pedal_operations;
+pub mod key_operations;
+pub mod pedal_operations;
 
 #[macro_use]
 mod messages;

src/pedal_operations.rs

@@ -1,6 +1,6 @@
 #[macro_use]
-#[path = "messages.rs"] mod messages;
-#[path = "key_operations.rs"] mod key_operations;
+#[path = "messages.rs"] pub mod messages;
+#[path = "key_operations.rs"] pub mod key_operations;
 
 extern crate hidapi;
 use std::process;