PSWsl assumes more than 1 distro

[TylerLeonhardt]

Method invocation failed because [System.Management.Automation.PSCustomObject] does not contain a method named 'Where'.
At C:\Program Files\PowerShell\Modules\PSWsl\0.2.1\PSWsl.psm1:184 char:20
+             return $distributionArray.Where( $Filter )
+                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : InvalidOperation: (Where:String) [], RuntimeException
+ FullyQualifiedErrorId : MethodNotFound

[TylerLeonhardt]

fixed in #16