chore(package): update codecov to version 3.0.0

Closes #236

Author: greenkeeper[bot]

package.json

@@ -42,7 +42,7 @@
     "babel-preset-react": "6.16.0",
     "babel-preset-stage-2": "6.18.0",
     "chai": "3.5.0",
-    "codecov": "1.0.1",
+    "codecov": "3.0.0",
     "enzyme": "2.6.0",
     "eslint": "3.12.2",
     "eslint-config-airbnb": "13.0.0",