Remove Travis (CI)

We're using BuildKite now

.travis.yml

@@ -1,30 +0,0 @@
-# we need trusty for the chrome addon
-dist: trusty
-
-# we don't need sudo, so can run in a container, which makes startup much
-# quicker.
-#
-# unfortunately we do temporarily require sudo as a workaround for
-# https://github.com/travis-ci/travis-ci/issues/8836
-sudo: required
-
-language: node_js
-node_js:
-    # make sure we work with a range of node versions.
-    #
-    # Current status of node versions: https://github.com/nodejs/LTS/
-    # Our minimum supported version is Node 10.
-    - 10
-    - 11
-addons:
-    chrome: stable
-before_install:
-    - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version 1.13.0
-    - export PATH=$HOME/.yarn/bin:$PATH
-install:
-    # clone the deps with depth 1: we know we will only ever need that one
-    # commit.
-    - scripts/fetch-develop.deps.sh --depth 1 && yarn install
-script:
-    - CHROME_BIN='/usr/bin/google-chrome-stable' yarn test
-    - yarn lint