Remove travis configuration, replaced by github actions.

.travis.yml

@@ -1,68 +0,0 @@
-language: python
-sudo: false
-cache: pip
-
-
-python:
-  - 3.5
-  - 3.6
-  - 3.7
-  - 3.8
-
-env:
-  - PYTHONHASHSEED=random
-    TEST_REQUIRE="gevent greenlet geventhttpclient fastimport"
-    TYPING_REQUIRE=mypy
-    PURE=false
-
-matrix:
-  include:
-    - python: 3.7
-      env: TEST_REQUIRE=fastimport
-      dist: xenial
-      sudo: true
-    - python: 3.8
-      env: TEST_REQUIRE=fastimport
-      dist: xenial
-      sudo: true
-    - python: 3.8
-      env: TEST_REQUIRE=fastimport
-      dist: xenial
-      sudo: true
-    - python: 3.6
-      env: PURE=true
-    - python: pypy3
-      env: MYPY_REQUIRE=
-
-install:
-  - travis_retry pip install -U pip coverage codecov flake8 $TYPING_REQUIRE $TEST_REQUIRE
-
-script:
-  - if [ $PURE = false ]; then python setup.py build_ext -i; fi
-  - python -m coverage run -p -m unittest dulwich.tests.test_suite
-
-  # Style
-  - make style
-  - if [ $MYPY_REQUIRE != "" ]; then make typing; fi
-
-  - if [ $PURE = true ]; then SETUP_ARGS=--pure; fi
-  - python setup.py $SETUP_ARGS bdist_wheel
-
-after_success:
-  - python -m coverage combine
-  - codecov
-
-deploy:
-  provider: pypi
-  user: dulwich-bot
-  password:
-    secure: Q8DDDojBugQWzXvmmEQiU90UkVPk+OYoFZwv1H9LYpQ4u5CfwQNWpf8qXYhlGMdr/gzWaSWsqLvgWLpzfkvqS4Vyk2bO9mr+dSskfD8uwc82LiiL9CNd/NY03CjH9RaFgVMD/+exMjY/yCtlyH1jL4kjgOyNnC+x4B37CliZHcE=
-  skip_cleanup: true
-  skip_existing: true
-  file_glob: true
-  file:
-    - dist/dulwich*.whl
-    - dist/dulwich*.tar.gz
-  on:
-    tags: true
-    repo: dulwich/dulwich