Add Node Fetch a popular bot

[summercms]

This bot hits our test servers all the time.

Some info:

Link: https://community.cloudflare.com/t/server-being-spammed-by-node-fetch-user-agent/133167

Link: https://webmasters.stackexchange.com/questions/124570/what-is-the-purpose-of-user-agent-node-fetch-fetching-just-the-base-url-from-our

Link: https://github.com/node-fetch/node-fetch

Example UA:

node-fetch/1.0 (+https://github.com/bitinn/node-fetch)

Testing Link: http://thadafinser.github.io/UserAgentParserComparison/v5/user-agent-detail/c5/bd/c5bd20f5-af96-4592-9668-0ed7ff7f0050.html

[coveralls]

Coverage increased (+0.02%) to 99.97% when pulling 181fb2e on ayumi-cloud:node-fetch into 880b9fa on WhichBrowser:master.

[NielsLeenheer]

Fixed by a8514f2