Replace request-promise-native with lightweight http client

[LogansUA]

Hello,

So basically the title is saying everything.

The main problem that request-promise-native library requires to have request library in each package.json (because request is a peer dependency for request-promise-native) which is using express-status-monitor.

I found this one http-client as really lightweight.
Here's comparison:

The got itself size:

The request and request-promise-native sizes:

Even axios is better:

Even better: since the it's simply GET request and the response data doesn't matter it would be really good to rewrite it using native http/https library (example)

Please consider to change it :)

Thank you.