Revert "Add codecov coverage report"

This reverts commit 304aab4 to
fix #18.

Conflicts:
	package.json

.travis.yml

@@ -8,7 +8,6 @@ script:
 - npm test
 after_script:
 - cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js
-- cat ./coverage/lcov.info | ./node_modules/.bin/codecov
 deploy:
   provider: npm
   email: dev@adrianhaasler.com

package.json

@@ -25,7 +25,6 @@
   "devDependencies": {
     "bluebird": "^3.3.4",
     "chai": "^3.5.0",
-    "codecov.io": "^0.1.6",
     "coveralls": "^2.11.9",
     "eslint-config-airbnb": "^6.2.0",
     "gulp": "^3.9.1",