Change Log for PSScriptTools

v2.20.0

Restructured Get-FileSizeInfo to better handle Windows PowerShell. (Issue #70)
Added Remove-MergedBranch with an alias of rmb. (Issue #71)
Added Get-ModuleCommand with an alias of gmc.
Added modulecommand.format.ps1xml to format Get-ModuleCommand results.
Added an alias of shtree for Show-Tree because pstree is a Linux command.
Added parameter alias files for -ShowItem in Show-Tree.
Added parameter alias properties for -ShowProperties in Show-Tree.
Added parameter alias ansi for dynamic parameter InColor in Show-Tree. (Issue #73)
Set the default parameter value for -Path in Show-Tree to the current directory.
Modified Show-Tree to allow the user to specify an array of properties. This is a breaking change as the parameter has been changed from a switch to string[]. (Issue #72)
Removed PROPERTY label in Show-Tree output when displaying properties.
Corrected errors in module manifest.
Added auto completer for Runspace parameter in Remove-Runspace.
Added alias rfn for New-RandomFileName.
Added alias cfn for New-CustomFileName.
Updated README.md.
ChangeLog.md clean up.