Document prerequisites

[hroederld]

I wasted a bit of time getting the correct version of Locust, as the main package name has changed from locustio to locust and they went 1.0.0 since this was written, with the required version only available in the abandoned one. This adds a bit of doc pointing out the dependency. Also a little section on requirements.txt, I know essentially every project does that but hopefully it reduces support requests. This is otherwise incredibly easy and well documented!

[bwoskow-ld]

In addition to documenting the prerequisites, what would the effort be to move to 1.0.0?

[tarqd]

@bwoskow-ld I've got a working PR for locust 1.0 but I haven't tested it too much: PR #4 . Works on my machine anyway :)
Besides replacing seq_task and renaming some classes/variables it looks like nothing important broke. I did have to uninstall the older version of locust on my machine because both packages wanted to be /usr/local/bin/locust

One gotcha I saw:
The class Locust was renamed to User and self.locust to self.user, which makes things a little uglier:

# gross
self.user.user

I changed the property to:

self.user.lduser

But I think that interface might need some refactoring for clarity