Fix bug where address 0xFFFF was not accessible

src/memory.rs

@@ -18,7 +18,7 @@ pub enum Error {
 /// of the Gameboy's memory, and should not be relied upon for anything other than development
 #[derive(Debug, Clone)]
 pub struct Memory {
-    data: [u8; MAX_MEMORY_ADDRESS],
+    data: [u8; MAX_MEMORY_ADDRESS + 1],
 }
 
 impl Memory {
@@ -67,7 +67,7 @@ impl Memory {
 impl Default for Memory {
     fn default() -> Self {
         Self {
-            data: [0_u8; MAX_MEMORY_ADDRESS],
+            data: [0_u8; MAX_MEMORY_ADDRESS + 1],
         }
     }
 }