Remove the unsuported password authentication

GitHub removed the support for password authentication
November 13, 2020 at 16:00 UTC in favor of the personal
access token. This commit removes all password references
from this project.

https://developer.github.com/changes/2020-02-14-deprecating-password-auth/

README.md

@@ -12,13 +12,13 @@ Open a PowerShell console at the location of the unpacked release and execute th
 ### Backup all git repositories of a user
 Execute the following to backup all git repositories of a GitHub user into the subdirectory `./YYYY-MM-DD/`.
 ```PowerShell
-.\backup_github_repositories.ps1 -userName "user" -userSecret "password"
+.\backup_github_repositories.ps1 -userName "user" -userSecret "token"
 ```
 
 ### Backup all git repositores of a organisation
 Execute the following to backup all git repositories of a GitHub organisation into the subdirectory `./YYYY-MM-DD/`.
 ```PowerShell
-.\backup_github_repositories.ps1 -userName "user" -userSecret "password" -organisationName "organisation"
+.\backup_github_repositories.ps1 -userName "user" -userSecret "token" -organisationName "organisation"
 ```
 
 ### Backup all git repositories of a user into a specific directory

backup_github_repositories.ps1

@@ -11,7 +11,7 @@ This script automatically backups all remote GitHub repositories of a user or an
 Specifies the GitHub user name.
 
 .PARAMETER userSecret
-Specifies the password or personal access token of the GitHub user.
+Specifies the personal access token of the GitHub user.
 
 .PARAMETER organisationName
 Specifies the optional GitHub organisation name.
@@ -23,10 +23,10 @@ Overrides the default backup directory.
 Overrides the default concurrency of 8.
 
 .EXAMPLE
-.\backup_github_repositories.ps1 -userName "user" -userSecret "secret"
+.\backup_github_repositories.ps1 -userName "user" -userSecret "token"
 
 .EXAMPLE
-.\backup_github_repositories.ps1 -userName "user" -userSecret "secret" -organisationName "organisation"
+.\backup_github_repositories.ps1 -userName "user" -userSecret "token" -organisationName "organisation"
 
 .EXAMPLE
 .\backup_github_repositories.ps1 -backupDirectory "C:\myBackupDirectory" -maxConcurrency 1
@@ -46,10 +46,10 @@ Param (
 
     [Parameter(
         Mandatory=$True,
-        HelpMessage="The password or personal access token of the GitHub user.",
+        HelpMessage="The personal access token of the GitHub user.",
         ParameterSetName = 'SecureSecret'
     )]
-    [Security.SecureString]${user password or personal access token},
+    [Security.SecureString]${personal access token},
     [Parameter(
         Mandatory = $True,
         ParameterSetName = 'PlainTextSecret'
@@ -72,7 +72,7 @@ Param (
 if ($userSecret) {
     $secureStringUserSecret = $userSecret | ConvertTo-SecureString -AsPlainText -Force
 } else {
-    $secureStringUserSecret = ${user password or personal access token}
+    $secureStringUserSecret = ${personal access token}
 }
 
 # Convert the secure user secret string into a plain text representation.