mention "order of installation" topic on the "Installation of Niquests" page

[andrei-korshikov]

There is already excellent and very detailed section "Notes / Frequently Asked Questions" in the urllib3.future Project description.

I think, a link to it should be placed somewhere in the Installation of Niquests along with short description of user's possibilities, e.g.:

• If you install niquests first, and another package which requires urllib3 second, then another package will use urllib3 (you call it "legacy", I call it "ordinary" or "plain").
• If you install niquests after another package, then another package will use urllib3.future (because of fork/shadowing magic).
• If you install niquests and another package simultaneously (e.g. via requirements.txt)—I don't know if the answer is predictable:))
• In case of upgrade, another package will use urllib3 or urllib3.future depending on which will be installed (upgraded) last.

And, of course, easy workaround for getting deterministic result: install / upgrade in any order, and then use

• pip install --force-reinstall urllib3, or
• pip install --force-reinstall urllib3.future.