Update Travis config to use gcc-arm-none-eabi-9-2019-q4-major on bionic

.travis.yml

@@ -1,4 +1,4 @@
-dist: xenial
+dist: bionic
 language: c
 compiler: gcc
 addons:
@@ -8,13 +8,14 @@ addons:
     packages:
       - gcc-8
       - cppcheck
+      - python3-venv
+      - wget
 services:
   - docker
 before_install:
-    - sudo add-apt-repository -y ppa:team-gcc-arm-embedded/ppa
-    - sudo apt-get update -q
-    - sudo apt-get install -y gcc-arm-embedded python3-venv
+  - wget -O gcc-arm.tar.bz2 'https://developer.arm.com/-/media/Files/downloads/gnu-rm/9-2019q4/RC2.1/gcc-arm-none-eabi-9-2019-q4-major-x86_64-linux.tar.bz2?revision=6e63531f-8cb1-40b9-bbfc-8a57cdfc01b4&la=en&hash=F761343D43A0587E8AC0925B723C04DBFB848339'
+  - sudo tar -jxvf gcc-arm.tar.bz2 --strip-components=1 -C /
+  - rm gcc-arm.tar.bz2
 script:
   - export CC=gcc-8
-  - pyenv shell 3.6.7
   - make travis