fix(package): update axios to version 0.19.1

Closes #36

Author: greenkeeper[bot]

package.json

@@ -11,7 +11,7 @@
     "@types/amqplib": "^0.5.4",
     "amqplib": "^0.5.2",
     "apidoc": "^0.17.6",
-    "axios": "^0.18.0",
+    "axios": "^0.19.1",
     "base-64": "^0.1.0",
     "debug": "^4.0.0",
     "express": "^4.16.2",