test: upload integration test logs from TravisCI to file.io

.travis.yml

@@ -16,4 +16,5 @@ script:
   - export PATH=$PATH:$GOPATH/bin
   - make travis
 after_script:
-  - find *.log | xargs -I{} sh -c "cat {} | nc termbin.com 9999 | xargs -r0 printf '{} uploaded to %s'"
+  - echo "Uploading to termbin.com..." && find *.log | xargs -I{} sh -c "cat {} | nc termbin.com 9999 | xargs -r0 printf '{} uploaded to %s'"
+  - echo "Uploading to file.io..." && tar -zcvO *.log | curl -s -F 'file=@-;filename=logs.tar.gz' https://file.io | xargs -r0 printf 'logs.tar.gz uploaded to %s\n'