BREAKING CHANGE: Added continuous delivery with a new CI pipeline

xDhcpServer
- Added automatic release with a new CI pipeline (issue #59.
- Conceptual help is now generated for each resource on build.

xDhcpServer
- BREAKING CHANGE: The minimum PowerShell version is 5.0.
xDhcpServerAuthorization
- BREAKING CHANGE: The resource is now a single instance resource so that it is only possible to use the resource once in a configuration with the parameter Ensure set to either Present or Absent (issue #40.
- The helper function Get-IPv4Address was changed from using Get-WmiObject to Get-CimInstance when fetching the enabled IP addresses.
xDhcpServerOptionDefinition
- The logic in Test-TargetResource was changed somewhat to remove unnecessary evaluation of properties that Get-TargetResource already did. The function Get-TargetResource calls Get-DhcpServerv4OptionDefinition with OptionId and VendorClass and if an object is returned the property Ensure is set to 'Present', so there are no point for Test-TargetResource to evaluate those two properties again.
- Added unit tests for the function Test-TargetResource.

BREAKING CHANGE: Removed the deprecated resource xDhcpServerOption which has been replaced by other DSC resources (issue #46).
Removed the file TestSampleUsingAzure.ps1 as it was not a working example of running integration tests.

[x] Added an entry under the Unreleased section of the change log in the README.md. Entry should say what was changed, and how that affects users (if applicable).
[x] Resource documentation added/updated in README.md.
[ ] Resource parameter descriptions added/updated in README.md, schema.mof and comment-based help.
[ ] Comment-based help added/updated.
[x] Localization strings added/updated in all localization files as appropriate.
[x] Examples appropriately added/updated.
[x] Unit tests added/updated. See DSC Resource Testing Guidelines.
[ ] Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
[x] New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

This change is

dsccommunity / xDhcpServer