chore(package): update codecov to version 2.3.1 (#97)

Closes #92

Author: flovilmart

package.json

@@ -27,7 +27,7 @@
     "babel-core": "^6.24.0",
     "babel-preset-es2015": "^6.24.0",
     "babel-preset-stage-0": "^6.22.0",
-    "codecov": "2.2.0",
+    "codecov": "2.3.1",
     "jasmine": "2.6.0",
     "jasmine-spec-reporter": "^4.0.0",
     "nyc": "^11.0.2"