bump dependencies to not depend on arm-none-eabi-gcc

.travis.yml

@@ -4,34 +4,18 @@ matrix:
   include:
     - env: TARGET=thumbv6m-none-eabi
       rust: nightly
-      addons:
-        apt:
-          packages:
-            - gcc-arm-none-eabi
       if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
 
     - env: TARGET=thumbv7m-none-eabi
       rust: nightly
-      addons:
-        apt:
-          packages:
-            - gcc-arm-none-eabi
       if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
 
     - env: TARGET=thumbv7em-none-eabi
       rust: nightly
-      addons:
-        apt:
-          packages:
-            - gcc-arm-none-eabi
       if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
 
     - env: TARGET=thumbv7em-none-eabihf
       rust: nightly
-      addons:
-        apt:
-          packages:
-            - gcc-arm-none-eabi
       if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
 
 before_install: set -e

Cargo.toml

@@ -9,9 +9,9 @@ repository = "https://github.com/japaric/cortex-m-quickstart"
 version = "0.3.3"
 
 [dependencies]
-cortex-m = "0.5.0"
-cortex-m-rt = "0.5.0"
-cortex-m-semihosting = "0.3.0"
+cortex-m = "0.5.6"
+cortex-m-rt = "0.5.3"
+cortex-m-semihosting = "0.3.1"
 panic-semihosting = "0.3.0"
 
 # Uncomment for the panic example.