Fix the last few instances of "chumpulator"

src/error.rs

@@ -1,7 +1,7 @@
 // (c) 2023 John A. Breaux
 // This code is licensed under MIT license (see LICENSE.txt for details)
 
-//! Error type for chumpulator
+//! Error type for Chirp
 
 use thiserror::Error;
 

src/lib.rs

@@ -19,7 +19,7 @@ pub struct Chip8 {
     pub bus: bus::Bus,
 }
 
-/// Common imports for chumpulator
+/// Common imports for Chirp
 pub mod prelude {
     pub use super::Chip8;
     use super::*;