Bump packages

And `yarn upgrade`

package.json

@@ -59,8 +59,8 @@
     "babel-preset-react-hmre": "^1.1.1",
     "babel-preset-stage-0": "^6.16.0",
     "chai": "^3.5.0",
-    "cross-env": "^3.1.4",
-    "css-loader": "^0.26.0",
+    "cross-env": "^4.0.0",
+    "css-loader": "^0.28.0",
     "es6-promise": "^4.0.3",
     "exports-loader": "^0.6.3",
     "express": "^4.14.0",
@@ -77,15 +77,15 @@
     "karma-webpack": "^2.0.2",
     "mocha": "^3.1.0",
     "node-sass": "^4.1.1",
-    "normalize.css": "^5.0.0",
+    "normalize.css": "^6.0.0",
     "react": "^15.3.2",
     "react-dom": "^15.3.2",
     "rimraf": "^2.5.4",
     "sass-loader": "^6.0.1",
     "screenfull": "^3.0.2",
     "snazzy": "^6.0.0",
     "standard": "^10.0.0",
-    "style-loader": "^0.13.1",
+    "style-loader": "^0.16.1",
     "webpack": "^2.2.1",
     "webpack-dev-middleware": "^1.8.3",
     "webpack-hot-middleware": "^2.12.2",