Add readme FAQ on how Got is better than node-fetch and request

[sindresorhus]

https://twitter.com/sindresorhus/status/1027276595822653440

[mesqueeb]

Definitely add Axios to the compare list!

[szmarczak]

please verify before publish

	got	request	node-fetch	axios
HTTP/2 support	✖	✖	✖	✖
Promise API	✔	✔	✔	✔
Stream API	✔	✔	✖	✖
Request cancelation	✔	✖	✖	✔
RFC compliant caching	✔	✖	✖	✖
Follows redirects	✔	✔	✔	✔
Retries on failure	✔	✖	✖	✖
Progress events	✔	✖	✖	✔
Handles gzip/deflate	✔	✔	✔	✔
Advanced timeouts	✔	✖	✖	✖
Errors with metadata	✔	✖	✖	✔
JSON mode	✔	✖	✖	✔
Custom defaults	✔	✔	✖	✔
Composable	✔	✖	✖	✖
Hooks	✔	✖	✖	✔
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