Release/v0.4.0

[n3snah]

Features

• Added: Support for installing PowerShell 7 on Ubuntu 18.04 and Ubuntu 20.04 systems.
• Added: Added information to readme to document any requirements.
• Added: Added new parameter apt_repository for Ubuntu PowerShell package management.
• Added: Many params in init.pp are now optional. Mainly because Linux would throw errors if they weren't defined.
• Added: Code coverage reports for RSPEC and Travis CI.
• Updated: Module has been updated to PDK v2.1.1.
• Updated: PowerShell Preview URL has been updated to 7.2.0 Preview 7
• Updated: REFERENCE.md has been regenerated via puppet strings to account for new changes for Ubuntu support.

Bugfixes

• Fix: Fixed case with Windows Server 2012 R2 as it wasn't testing correctly.
• Fix: Added in missing Table of Contents link for PowerShell Windows Colors.
• Fix: Deploy stage has been set to master instead of main.