Travis update to Ubuntu 14.04 (Trusty Thar).

.travis.yml

@@ -36,6 +36,8 @@ addons:
 # We use cpp for unit tests, and c for the main project.
 language: cpp
 compiler: clang
+dist: trusty
+
 
 before_install:
   - pip install --user cpp-coveralls
@@ -48,6 +50,7 @@ before_script:
   - tools/gcc-arm-none-eabi-6-2017-q1-update/bin/arm-none-eabi-gcc --version
   - clang --version
   - clang++ --version
+  - gcc --version
 
 script: ./.travis.sh