Upgrade to Rust 2018 edition

Cargo.toml

@@ -34,6 +34,7 @@ version = "0.2.0"
 authors = ["The 6502-rs Developers"]
 build = "build.rs"
 exclude = ["examples/**"]
+edition = "2018"
 
 [lib]
 # This will look in src/lib.rs

README.md

@@ -17,7 +17,6 @@ use mos6502::address::Address;
 use mos6502::cpu;
 
 fn main() {
-
     let zero_page_data = [56, 49];
 
     let program = [
@@ -51,6 +50,5 @@ fn main() {
     cpu.run();
 
     assert_eq!(7, cpu.registers.accumulator);
-    
 }
 ```

src/cpu.rs

@@ -25,11 +25,10 @@
 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 // POSSIBILITY OF SUCH DAMAGE.
 
-use address::{Address, AddressDiff};
-use instruction;
-use instruction::{DecodedInstr, Instruction, OpInput};
-use memory::Memory;
-use registers::{Registers, StackPointer, Status, StatusArgs};
+use crate::address::{Address, AddressDiff};
+use crate::instruction::{self, DecodedInstr, Instruction, OpInput};
+use crate::memory::Memory;
+use crate::registers::{Registers, StackPointer, Status, StatusArgs};
 
 #[derive(Clone)]
 pub struct CPU {

src/instruction.rs

@@ -25,9 +25,9 @@
 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 // POSSIBILITY OF SUCH DAMAGE.
 
-use address::Address;
-use address::AddressDiff;
-use cpu::CPU;
+use crate::address::Address;
+use crate::address::AddressDiff;
+use crate::cpu::CPU;
 
 // Abbreviations
 //

src/memory.rs

@@ -25,7 +25,7 @@
 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 // POSSIBILITY OF SUCH DAMAGE.
 
-use address::{Address, AddressDiff};
+use crate::address::{Address, AddressDiff};
 
 // JAM: We can probably come up with a better way to represent address ranges.
 //      Address range type?

src/registers.rs

@@ -25,8 +25,8 @@
 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 // POSSIBILITY OF SUCH DAMAGE.
 
-use address::{Address, AddressDiff};
-use memory::{STACK_ADDRESS_HI, STACK_ADDRESS_LO};
+use crate::address::{Address, AddressDiff};
+use crate::memory::{STACK_ADDRESS_HI, STACK_ADDRESS_LO};
 
 // Useful for constructing Status instances
 #[derive(Copy, Clone)]