fix(package): update axios to version 0.19.0

Closes #10

Author: greenkeeper[bot]

package.json

@@ -28,7 +28,7 @@
     "standard": "^8.5.0"
   },
   "dependencies": {
-    "axios": "^0.15.2",
+    "axios": "^0.19.0",
     "co": "^4.6.0",
     "flyd": "^0.2.2",
     "ramda": "^0.23.0",