remove panic-itm dependency

.travis.yml

@@ -4,15 +4,39 @@ matrix:
   include:
     - env: TARGET=thumbv6m-none-eabi
       rust: nightly
+      addons:
+        apt:
+          sources:
+            - debian-sid
+          packages:
+            - binutils-arm-none-eabi
 
     - env: TARGET=thumbv7m-none-eabi
       rust: nightly
+      addons:
+        apt:
+          sources:
+            - debian-sid
+          packages:
+            - binutils-arm-none-eabi
 
     - env: TARGET=thumbv7em-none-eabi
       rust: nightly
+      addons:
+        apt:
+          sources:
+            - debian-sid
+          packages:
+            - binutils-arm-none-eabi
 
     - env: TARGET=thumbv7em-none-eabihf
       rust: nightly
+      addons:
+        apt:
+          sources:
+            - debian-sid
+          packages:
+            - binutils-arm-none-eabi
 
 before_install: set -e
 

Cargo.toml

@@ -14,7 +14,6 @@ cortex-m-rt = "0.4.0"
 cortex-m-semihosting = "0.2.0"
 panic-abort = "0.1.1"
 panic-semihosting = "0.1.0"
-panic-itm = "0.1.0"
 # Uncomment for the allocator example.
 #alloc-cortex-m = "0.3.3"