Min powershell version to build hangfire

I was trying to build hangfire via build.bat but was seeing the following error:

Running OpenCover/xUnit for 'Hangfire.Core.Tests'...                                                                                                                                
  Using directory C:\Dev\Hangfire\tests\Hangfire.Core.Tests\bin\Release                                                                                                             
Incorrect Arguments: The argument [*.Tests]* is not recognised                                                                                                                      
Error: 7/12/2017 10:00:39 AM:                                                                                                                                                       
 At C:\Dev\Hangfire\packages\psake.4.4.1\tools\psake.psm1:147 char:22 +                 throw <<<<  ("Exec: " + $errorMessage) [<<==>>] Exception: Exec: Error executing command    
 .$opencover -target:"$xunit_path" -targetargs:"`"$assembly`" -noshadow $extra" -filter:"$coverageFilter" -mergeoutput -output:"$coverageFile" -register:user -returntargetcode    .
ERROR CODE: 1                                        

At the time, I had powershell v2 installed. Upgrading to v5 fixed the problem. Looks like there were some quote escaping issues. Just wanted to report my findings since I didn’t see any mention of it in the readme/repo. I’m not sure what the minimum required version is but it seems v2 is too low.