Merge pull request #264 from slurdge/fix_linux_travis

Fix build for linux on travis

.travis.yml

@@ -1,22 +1,16 @@
 # Travis-CI Build for RfidResearchGroup/Proxmark3
 language: c
 
-#default linux build env is: Ubuntu 14.04 trusty
+#default linux build env is: xenial
 compiler: gcc
 
 # Test on Linux and MacOS
 matrix:
   include:
-#    - os: osx
-#      osx_image: xcode7.3	# OS X 10.11
-#    - os: osx
-#      osx_image: xcode8.3   # OS X 10.12
-#    - os: osx
-#      osx_image: xcode9     # OS X 10.13
     - os: osx
       osx_image: xcode9.1   # OS X 10.13.1
     - os: linux
-      dist: trusty
+      dist: xenial
       sudo: required
 
 before_install:
@@ -25,7 +19,7 @@ before_install:
 ## Note: all dependencies on MacOS should be resolved by the brew install command
   if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then 
     sudo apt-get update -qq;
-    sudo apt-get install -y gcc-arm-none-eabi;
+    sudo apt-get install -y gcc-arm-none-eabi libnewlib-dev;
   elif [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
     brew update;
     brew tap RfidResearchGroup/proxmark3;