Removing .travis.yml as it's been replaced by GitHub Actions

.travis.yml

@@ -1,35 +0,0 @@
-# Use older, non-container infrastructure to allow sudo
-sudo: required
-
-language: python
-
-python:
-  - 2.7
-  - 3.4
-  - 3.5
-  - 3.6
-  - pypy
-
-env:
-  - BUILD_CAPNP=
-  - BUILD_CAPNP=true
-  - BUILD_CAPNP=true CFLAGS="-DKJ_DEBUG"
-
-# skip testing for pypy + BUILD_CAPNP=false since it's failing in travis for some reason
-matrix:
-  exclude:
-    - python: pypy
-      env: BUILD_CAPNP=
-
-compiler: gcc
-
-before_install:
-  - buildutils/setup_travis.sh
-  - travis_retry pip install -U setuptools
-  - travis_retry pip install cython==0.21.2
-  - travis_retry pip install pytest
-
-install:
-  - travis_retry pip install --editable .
-
-script: py.test test;