Update to latest codecov uploader

Author: sharwell

.nuget/packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Codecov" version="1.0.1" />
+  <package id="Codecov" version="1.1.0" />
   <package id="Microsoft.DiaSymReader.Pdb2Pdb" version="1.1.0-beta1-62624-01" />
   <package id="OpenCover" version="4.6.519" />
   <package id="ReportGenerator" version="2.3.5.0" targetFramework="net452" />

appveyor.yml

@@ -16,7 +16,10 @@ test_script:
     if ($env:Configuration -eq 'Debug') {
       .\opencover-report.ps1 -Debug -NoBuild -NoReport -AppVeyor
       if ($LastExitCode -ne 0) { $host.SetShouldExit($LastExitCode) }
-      ..\packages\Codecov.1.0.1\tools\codecov.exe -f '..\build\OpenCover.Reports\OpenCover.DocumentationAnalyzers.xml'
+      $packageConfig = [xml](Get-Content ..\.nuget\packages.config)
+      $codecov_version = $packageConfig.SelectSingleNode('/packages/package[@id="Codecov"]').version
+      $codecov = "..\packages\Codecov.$codecov_version\tools\codecov.exe"
+      &$codecov -f '..\build\OpenCover.Reports\OpenCover.DocumentationAnalyzers.xml'
     } else {
       .\opencover-report.ps1 -NoBuild -NoReport -AppVeyor
       if ($LastExitCode -ne 0) { $host.SetShouldExit($LastExitCode) }