Print response content in case we cannot upload artifact to bintray.

scripts/upload_kiwix_lib_android_to_bintray.py

@@ -48,6 +48,7 @@ def upload(version, filepath, artefact):
     rcode_family = rcode // 100
     if rcode_family not in (2, 3):
         print("ERROR: Fail to upload artefact")
+        print(r.text)
         return False
 
     return True

travis/deploy.sh

@@ -83,6 +83,7 @@ then
   fi
   )
 
+  ls $BINTRAY_ARCHIVES_DIR
   BINTRAY_ARCHIVES=$(find $BINTRAY_ARCHIVES_DIR -name "*_bintray_info.json" -type f)
   if [[ "x$BINTRAY_ARCHIVES" != "x" ]]
   then