Update build chain dependencies

Author: nulltoken

appveyor.yml

@@ -74,10 +74,12 @@ install:
       cinst sourcelink -y
     }
 
+    $Env:SHOULD_RUN_COVERALLS = $True
+
     If ($Env:SHOULD_RUN_COVERALLS -eq $True)
     {
-      nuget install OpenCover -Version 4.5.3723 -ExcludeVersion -OutputDirectory .\packages
-      nuget install coveralls.net -Version 0.5.0 -ExcludeVersion -OutputDirectory .\packages
+      nuget install OpenCover -Version 4.6.166 -ExcludeVersion -OutputDirectory .\packages
+      nuget install coveralls.net -Version 0.6.0 -ExcludeVersion -OutputDirectory .\packages
     }
 
     If ($Env:SHOULD_RUN_COVERITY_ANALYSIS -eq $True)
@@ -110,7 +112,7 @@ test_script:
 - ps: |
     If ($Env:SHOULD_RUN_COVERALLS -eq $True -and $Env:publish_on_success -eq $True)
     {
-      .\packages\OpenCover\OpenCover.Console.exe `
+      .\packages\OpenCover\tools\OpenCover.Console.exe `
         -register:user `
         "-target:""$Env:APPVEYOR_BUILD_FOLDER\packages\xunit.runner.console.2.0.0\tools\$Env:xunit_runner""" `
         "-targetargs:""$Env:APPVEYOR_BUILD_FOLDER\LibGit2Sharp.Tests\bin\Release\LibGit2Sharp.Tests.dll"" -noshadow" `