adapt to changes in cortex-m

src/delay.rs

@@ -15,7 +15,7 @@ pub struct Delay {
 
 impl Delay {
     /// Configures the system timer (SysTick) as a delay provider
-    pub fn new(syst: SYST, clocks: Clocks) -> Self {
+    pub fn new(mut syst: SYST, clocks: Clocks) -> Self {
         syst.set_clock_source(SystClkSource::Core);
 
         Delay { syst, clocks }