Update toolchain in CI

.travis.yml

@@ -5,10 +5,6 @@ language: c
 services:
   - docker
 
-env:
-  - TEST_SUITE=gnat-6.3
-  - TEST_SUITE=gnat-community-2018
-
 git:
   submodules: false
 
@@ -16,5 +12,4 @@ before_install:
   - git submodule update --init --recursive --depth=1
 
 script:
-  - if [ "$TEST_SUITE" = "gnat-6.3" ]; then docker run -v $PWD:/app -w /app debian:stretch /bin/sh -c "apt-get update && apt-get install -y --no-install-recommends gcc gnat gprbuild make libaunit3.7.2-dev && make test"; fi
-  - if [ "$TEST_SUITE" = "gnat-community-2018" ]; then docker run -v $PWD:/app -w /app jklmnn/gnat:gpl.2018.slim /bin/sh -c "make test"; fi
+  - docker run -v $PWD:/app -w /app componolit/ci:gnat-community-2019 /bin/sh -c "make"