Bump packages

Author: cookpete

package.json

@@ -68,7 +68,7 @@
     "babel-loader": "^8.0.6",
     "babel-plugin-istanbul": "^5.2.0",
     "codecov": "^3.5.0",
-    "cross-env": "^5.2.0",
+    "cross-env": "^6.0.0",
     "css-loader": "^3.2.0",
     "enzyme": "^3.10.0",
     "enzyme-adapter-react-16": "^1.14.0",
@@ -85,7 +85,7 @@
     "react-hot-loader": "^4.12.11",
     "rimraf": "^3.0.0",
     "sanitize.css": "^11.0.0",
-    "screenfull": "^4.2.1",
+    "screenfull": "^5.0.0",
     "sinon": "^7.4.1",
     "snazzy": "^8.0.0",
     "standard": "^14.0.0",