Dependencies for hypothesis, pytest and web3 are outdated

[iamdefinitelyahuman]

Overview

The latest versions of hypothesis, pytest and web3 all break functionality somewhere in Brownie.

Specification

Someone needs to bump each dependency to the latest version, fix the failing tests, and play around in the console / run some large test suites to make sure there is no further weirdness. This could be a big-ish job, given the level of hackiness and touching-private-APIs that brownie does with pytest and hypothesis 😬