ci: drop travis config

.travis.yml

@@ -1,46 +0,0 @@
-# adapted from
-# https://github.com/greghendershott/travis-racket/blob/master/.travis.yml
-# Thanks Greg!
-
-dist: trusty
-language: c
-sudo: false
-
-env:
-  global:
-    - RACKET_DIR=~/racket
-  matrix:
-    - RACKET_VERSION=6.3
-    - RACKET_VERSION=6.6
-    - RACKET_VERSION=6.9
-    - RACKET_VERSION=6.12
-    - RACKET_VERSION=7.0
-    - RACKET_VERSION=7.3
-    - RACKET_VERSION=7.4
-    - RACKET_VERSION=7.5
-    - RACKET_VERSION=7.6
-    - RACKET_VERSION=HEAD
-    - RACKET_VERSION=HEADCS
-
-# You may want to test against certain versions of Racket, without
-# having them count against the overall success/failure.
-matrix:
-  allow_failures:
-    - env: RACKET_VERSION=HEAD
-    - env: RACKET_VERSION=HEADCS
-  # Fast finish: Overall build result is determined as soon as any of
-  # its rows have failed, or, all of its rows that aren't allowed to
-  # fail have succeeded.
-  fast_finish: true
-
-before_install:
-  - "export DISPLAY=:99.0" # needed for testing with `racket/gui`
-  - "sh -e /etc/init.d/xvfb start" # needed for testing with `racket/gui`
-  - git clone https://github.com/mbutterick/travis-racket.git
-  - cat travis-racket/install-racket.sh | bash # pipe to bash not sh!
-  - export PATH="${RACKET_DIR}/bin:${PATH}" #install-racket.sh can't set for us
-
-script:
- - cd ..   # Travis did a cd into the dir. Back up, for the next:
- - travis_retry raco pkg install --deps search-auto https://github.com/mbutterick/pollen.git
- - raco test -p pollen