v4.2.0

Feature

• helper to extract mutation parameters from request (197a775)
• run pytest in parallel with xdist (9a435d9)
• allow filtering answers to limit only visible answers (0eb037f)
• add pipenv setup command to setup.py (448b821)

Fix

• use root form as form property in QuestionJexl context (5f422c0)
• remove insignificant performance hack (db3d842)
• use "development" instead of "dev" as documented (1645ed9)

Documentation

• add info about the UID variable (f9a8d3f)
• add more detailed example for the pipenv workflow (16a94a8)