Remove usage of Travis CI

.travis.yml

@@ -1,19 +0,0 @@
-language: ruby
-sudo: false
-env:
-  matrix:
-  - BROWSER=chromium EXT=zip
-  - BROWSER=firefox EXT=xpi
-  - BROWSER=thunderbird EXT=xpi
-script: "./tools/make-${BROWSER}.sh ${TRAVIS_TAG}"
-deploy:
-  provider: releases
-  prerelease: true
-  api_key:
-    secure: ujdEXakLw9fncnI70udUSrRvB0nNUogGr08/eC5UqS4uf5GJ6W6LAB2kNUIn2BaJujQEdYEeH7nFmRKzbqwQs4N1Qm9qOq75zOV6FP/922lSMuPuKB7rXVNRK88WYs/j7g40JEDKEjEYKGa4m3OGnDnywIoKtAsI3kqcCBOe34A=
-  file: dist/build/uBlock0_${TRAVIS_TAG}.${BROWSER}.${EXT}
-  skip_cleanup: true
-  on:
-    repo: gorhill/uBlock
-    tags: true
-    all_branches: true