Update panics

src/microbit/Cargo.toml

@@ -5,6 +5,6 @@ version = "0.1.0"
 [dependencies]
 cortex-m-rt="~0.6"
 cortex-m-semihosting="~0.3"
-panic-abort = "~0.3"
+panic-halt = "~0.2"
 panic-semihosting = "~0.5"
 microbit="~0.7"

src/microbit/examples/buttons.rs

@@ -1,7 +1,7 @@
 #![no_std]
 #![no_main]
 
-extern crate panic_abort;
+extern crate panic_halt;
 extern crate cortex_m_rt as rt;
 extern crate microbit;
 

src/microbit/examples/buttons_poll.rs

@@ -1,7 +1,7 @@
 #![no_std]
 #![no_main]
 
-extern crate panic_abort;
+extern crate panic_halt;
 extern crate cortex_m_rt as rt;
 extern crate microbit;
 

src/microbit/examples/display_blocking.rs

@@ -5,7 +5,7 @@
 extern crate microbit;
 extern crate cortex_m_rt as rt;
 extern crate cortex_m_semihosting as sh;
-extern crate panic_abort;
+extern crate panic_halt;
 
 use core::fmt::Write;
 use rt::entry;