Update appveyor.yml

appveyor.yml

@@ -34,4 +34,8 @@ test_script:
   - 'IF "%COVERAGE%" == "true" (npm run cover) ELSE (npm test)'
   - 'IF "%COVERAGE%" == "true" (npm run cover) ELSE (npm test)'
   
   
 after_test:
 after_test:
-  - ps: (Invoke-WebRequest https://codecov.io/bash).toString() | bash -f .\coverage\lcov.info
+  - ps: |
+    if (Test-Path env:\COVERAGE) {
+       Invoke-WebRequest https://codecov.io/bash -OutFile codecov.sh
+       ./codecov.sh -f .\coverage\lcov.info
+    }