override-client-name doesn't allow periods

[benwa]

Before filling a bug

• have you checked the faq for known issues.
• have you checked existing issues

Describe the bug
When building a PowerShell module, I see that override-client-name removes all periods, which are a valid character.

Expected behavior
Periods are not removed from the module name.

Additional context
See PagerDutyEventsV1, which should be PagerDuty.EventsV1. You can see that periods are allowed, as both Microsoft.PowerShell.Management and Microsoft.PowerShell.Utility include them.

S /home/ben [PagerDutyEventsV1]> Get-Module

ModuleType Version    PreRelease Name                                ExportedCommands
---------- -------    ---------- ----                                ----------------
Manifest   7.0.0.0               Microsoft.PowerShell.Management     {Add-Content, Clear-…
Manifest   7.0.0.0               Microsoft.PowerShell.Utility        {Add-Member, Add-Typ…
Script     0.1.0                 PagerDutyEventsV1                   New-EventV1
Script     2.3.5                 PSReadLine                          {Get-PSReadLineKeyHa…

readme.md

    ```yaml
    powershell: true
    clear-output-folder: true
    license-header: MICROSOFT_MIT_NO_VERSION
    ```
    
    ```yaml $(tag) == 'events-v1'
    namespace: PagerDuty.EventsV1
    override-client-name: PagerDuty.EventsV1
    input-file: events-v1.json
    output-folder: events-v1
    directive:
    - select: command
      where:
        subject: (^V1)(.*)
      set:
        subject: $2V1
    - where:
        parameter-name: Client
      set:
        parameter-name: ClientName
    ```