fix: 🐛 tweaked coveralls to avoid warnings on fresh install (#75)

Author: diogofcunha

.travis.yml

@@ -5,15 +5,14 @@ node_js:
   - 8
 
 before_install:
-  - yarn add codecov.io coveralls --global
+  - yarn add coveralls -D
 
 script:
   - yarn run build
   - yarn run test:coverage
 
 after_success:
-  - cat ./coverage/lcov.info | ./node_modules/codecov.io/bin/codecov.io.js
-  - cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js
+  - cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage
   - npx semantic-release
 
 branches: