Code Climate's cc-test-reporter after-build subcommand doesn't work, …

…so changed it to the format-coverage and upload-coverage ones instead.

.travis.yml

@@ -24,7 +24,9 @@ script:
 - dotnet build RomanizationNet.sln --configuration Release --no-restore
 - dotnet test /p:CollectCoverage=true /p:CoverletOutputFormat=cobertura RomanizationTests/RomanizationTests.csproj
 
-after_script: ./cc-test-reporter after-build --coverage-input-type cobertura --exit-code $TRAVIS_TEST_RESULT
+after_script:
+- ./cc-test-reporter format-coverage --input-type cobertura --output RomanizationTests/codeclimate.json RomanizationTests/coverage.cobertura.xml
+- ./cc-test-reporter upload-coverage --input RomanizationTests/codeclimate.json
 
 before_deploy: echo "Installing docfx..." && wget -q "https://github.com/dotnet/docfx/releases/download/v2.56.6/docfx.zip" && unzip -q -o -d ./docfx docfx.zip