chore(travis): simplify config

.travis.yml

@@ -14,14 +14,9 @@ before_install:
 - npm i -g npm@^2.0.0
 before_script:
 - npm prune
-- curl -Lo travis_after_all.py https://raw.github.com/dmakhno/travis_after_all/master/travis_after_all.py
+- curl -Lo travis_after_all.py https://git.io/vLSON
 after_success:
 - python travis_after_all.py
 - export $(cat .to_export_back)
 - if [[ $BUILD_LEADER = YES ]]; then npm run coverage:upload; fi
-after_failure:
-- python travis_after_all.py
-- export $(cat .to_export_back)
-after_script:
-- rm -f travis_after_all.py .to_export_back
 - npm run semantic-release