message: update chai and node-sass versions
diff: "babel-preset-es2015": "^6.16.0",
  "babel-preset-react": "^6.16.0",
  "babel-preset-stage-1": "^6.16.0",
  - "chai": "^3.5.0",
  + "chai": "3.5.0",
  "codecov.io": "^0.1.6",
  "copy-webpack-plugin": "^3.0.1",
  "css-loader": "^0.25.0",
  "karma-phantomjs-launcher": "^1.0.2",
  "karma-webpack": "^1.8.0",
  "mocha": "^3.1.0",
  - "node-sass": "^3.10.1",
  + "node-sass": "3.13.1",
  "phantomjs-prebuilt": "^2.1.13",
  "postcss-cssnext": "^2.8.0",
  "postcss-loader": "^0.13.0",
  