Goodbye Travis

I don't really know why the build failed in Travis, even though it is
using the same scripts.

Thank you for all the hardwork.

.travis.yml

@@ -1,25 +0,0 @@
-sudo: required
-
-language: python
-
-services:
-  - docker
-
-python:
-  - '3.7'
-
-env:
-  - SCENARIO=datadir_init
-  - SCENARIO=streaming_replication
-  - SCENARIO=collations
-  - SCENARIO=extensions
-  - SCENARIO=logical_replication
-
-before_script:
-  - pip install -U docker-compose
-  - ./build-test.sh
-
-script:
-  - pushd scenario_tests/${SCENARIO}
-  - ./test.sh
-  - popd