Update request to at least 2.54.0 to support NO_PROXY

[Frank Jakop]

Pleas upgrade the dependency request to a version >= 2.54.0. Since this version it honors the env variable NO_PROXY, so we can disable the proxy for testing purposes, like tests with nock.

[Powersource]

This looks to be fixed https://github.com/peterbraden/ical.js/blame/master/package.json#L18

But I'm having this issue request/request#2040
I'm gonna try to fix this tomorrow.