Remove travis configuration, it's no longer used

.travis.yml

@@ -1,27 +0,0 @@
-language: python
-python:
-  - '2.7'
-  - '3.6'
-  - '3.7'
-  - '3.8'
-addons:
-  apt:
-    packages:
-      - diffstat
-sudo: false
-before_script: cd $TRAVIS_BUILD_DIR/tests
-script: python suite.py
-before_deploy:
-  - cd $TRAVIS_BUILD_DIR/
-  - rm -rf $TRAVIS_BUILD_DIR/dist/*
-deploy:
-  provider: pypi
-  skip_existing: true
-  skip_cleanup: true
-  user: suse
-  password:
-    secure: R4+YNPW2tsiY06hibGvONYn0//1z1QdcY8VmNbYpIRly4eTAbPE9uejKpyuflUkznpEkoqCdFzi5FNFhgat9N+AkIKyX9NTkf0oxaKKbdqBM7H1V8bqLYlAO479262spRyO0ee5fV5v6g81AFjncIV+pGjtQ0Vg/sjVcvGa61bs=
-  on:
-    tags: true
-    distributions: sdist
-    repo: openSUSE/osc