Fixes Nightwatch integration for Nightwatch v3.1.0

[justafish]

Upgrading your project will require you to:

• Remove nightwatch-accessibility
• Add nightwatch-axe-verbose
• Swap .initAccessibility() for .axeInject() e.g.

  browser
      .axeInject()
      .axeRun('body')
  

• If using Yarn Berry, .yarnrc.yml will need to contain the following:

  packageExtensions:
    "nightwatch@*":
      dependencies:
        ws: "*"
        lodash: "*"
  

• Other package managers should add lodash manually to devDependencies