Adapt to new interface

src/lib.rs

@@ -155,7 +155,7 @@
 //!             println!("Error: {:?}", e);
 //!         }
 //!         Ok(_) => {
-//!             let channel = radio.get_channel().unwrap_or(-1.0);
+//!             let channel = radio.channel().unwrap_or(-1.0);
 //!             println!("Found channel at {:1} MHz", channel);
 //!             delay.delay_ms(5000_u16); // listen for 5 seconds, then seek again
 //!         }