Update PRReportGeneration.ps1 (#773)

The datetime parsing logic interprets the month as minutes instead and so the parsed datetime is incorrect causing the loop to exit prematurely. Small fix to interpret as month instead.

Author: digitalinfinity

examples/PRReportGeneration.ps1

@@ -28,7 +28,7 @@ while($continueFetching)
     {
         $prClosedDateInString = $pr | Select-Object -ExpandProperty closedDate
         Write-Host -NoNewline "."
-        $prClosedData = [datetime]::ParseExact($prClosedDateInString.SubString(0,10),'yyyy-mm-dd', $null)
+        $prClosedData = [datetime]::ParseExact($prClosedDateInString.SubString(0,10),'yyyy-MM-dd', $null)
         $prId = $pr | Select-Object -ExpandProperty pullRequestId        
 
         $prDetails = az repos pr show --org $org --id $prId -o json | ConvertFrom-Json
@@ -57,4 +57,4 @@ Write-Host "."
 Write-Host "ByPassed PR count $($bypassedCount)"
 Write-Host "Non ByPassed PR count $($nonByPassedCount)"
 Write-Host "ByPassed PR details"
-Write-Host $bypassPRsInfo
+Write-Host $bypassPRsInfo