Update README.md

[crypticgeek]

Shouldn't the command to load the powerview module should point to the script module file?

For example:

PS > Import-Module .\powerview.ps1
PS > Get-Command -Module powerview
PS >

vs

PS > Import-Module .\powerview.psm1
PS > Get-Command -Module powerview

CommandType     Name                            Definition
-----------     ----                            ----------
Function        Add-Win32Type                   ...
Function        Export-CSV                      ...
Function        field                           ...
Function        func                            ...
Function        Get-ComputerProperties          ...
Function        Get-HostIP                      ...
Function        Get-LastLoggedOn                ...
Function        Get-NetComputers                ...
Function        Get-NetConnections              ...
<snip>

[HarmJ0y]

Added into README.md.