udpate travis badge, remove codecov

package.json

@@ -6,7 +6,6 @@
   "scripts": {
     "build": "rm -rf lib && babel src --out-dir lib",
     "package": "git checkout -B package-lib && npm run build && git add -f lib && git commit -m 'package lib' && echo Use npm to tag and publish",
-    "coverage": "nyc report --reporter=text-lcov > coverage.lcov && codecov",
     "prepublish": "in-publish && npm run test || not-in-publish",
     "test": "retire -n -p package.json && npm run build && npm run unit",
     "unit": "nyc --require babel-core/register mocha test/src/**"
@@ -33,7 +32,6 @@
     "babel-eslint": "~4.1.8",
     "babel-plugin-add-module-exports": "~0.1.2",
     "babel-preset-es2015": "~6.6.0",
-    "codecov": "~1.0.1",
     "eslint": "~1.10.3",
     "eslint-plugin-mocha": "~1.1.0",
     "eslint-plugin-react": "~4.2.3",