Updated gcc package version from precise to trusty

Author: cmonr

circle.yml

@@ -83,4 +83,4 @@ dependencies:
         - mkdir .tests
         - sudo add-apt-repository -y ppa:terry.guo/gcc-arm-embedded
         - sudo apt-get -y update
-        - sudo apt-get -y install gcc-arm-none-eabi=4.9.3.2015q3-1precise1
+        - sudo apt-get -y install gcc-arm-none-eabi=4.9.3.2015q3-1trusty1