Fix typo in Pestertest naming (missing -Not)

[Stephanevg]

Currently:

{ $Woop.MyMethod($Plop) } | Should Not Throw

Should be

{ $Woop.MyMethod($Plop) } | Should **-Not** Throw

https://github.com/Stephanevg/PSClassUtils/blob/master/PSClassUtils/PSClassUtils.psm1#L2191

https://github.com/Stephanevg/PSClassUtils/blob/master/PSClassUtils/PSClassUtils.psm1#L2194

https://github.com/Stephanevg/PSClassUtils/blob/master/PSClassUtils/PSClassUtils.psm1#L2221

https://github.com/Stephanevg/PSClassUtils/blob/master/PSClassUtils/PSClassUtils.psm1#L2295

https://github.com/Stephanevg/PSClassUtils/blob/master/PSClassUtils/PSClassUtils.psm1#L2333C73-L2333C73