Try to upload to coveralls.io

appveyor.yml

@@ -1,7 +1,9 @@
 version: 10.0.{build}
 image: Visual Studio 2017
 configuration: Release
-
+environment:
+  COVERALLS_REPO_TOKEN:
+    secure: /SEtLgIE6ZrJaWBC1xFZIeESiwfwiXEk9N4pSJ53rFhqBZC2sXJg7ZxZ1DBhnZGu
 install:
 - ps: >-
     cd src
@@ -48,7 +50,9 @@ after_test:
 - ps: >-
     if($env:APPVEYOR_REPO_BRANCH -eq "master") {
       cd ..
-      csmacnz.Coveralls --opencover -i coverage.xml
+      if (Test-Path "./coverage.xml") {
+        csmacnz.Coveralls --opencover -i "./coverage.xml" --repoToken $env:COVERALLS_REPO_TOKEN --basePath "$env:APPVEYOR_BUILD_FOLDER" --useRelativePath --commitId $env:APPVEYOR_REPO_COMMIT --commitBranch $env:APPVEYOR_REPO_BRANCH --commitAuthor $env:APPVEYOR_REPO_COMMIT_AUTHOR --commitEmail $env:APPVEYOR_REPO_COMMIT_AUTHOR_EMAIL --commitMessage $env:APPVEYOR_REPO_COMMIT_MESSAGE --jobId $env:APPVEYOR_BUILD_NUMBER --serviceName appveyor
+      }
       cd src
     }