fix(package): update axios to version 0.19.1

Closes #26

Author: greenkeeper[bot]

package.json

@@ -51,7 +51,7 @@
     "webpack-dev-server": "^3.1.10"
   },
   "dependencies": {
-    "axios": "^0.18.0",
+    "axios": "^0.19.1",
     "react": "^16.6.0",
     "react-dom": "^16.6.0"
   }