updated api with api-cloud

Author: rishav-csenitjsr

android/README.md

@@ -7,7 +7,7 @@
 * Upload your Native App (.apk file) to BrowserStack servers using upload API:
 
   ```
-  curl -u "username:accesskey" -X POST "https://api.browserstack.com/app-automate/upload" -F "file=@/path/to/app/file/Application-debug.apk"
+  curl -u "username:accesskey" -X POST "https://api-cloud.browserstack.com/app-automate/upload" -F "file=@/path/to/app/file/Application-debug.apk"
   ```
 
 * If you do not have an .apk file and looking to simply try App Automate, [you can download our sample app and upload](https://www.browserstack.com/app-automate/sample-apps/android/WikipediaSample.apk)