Update readme.md with troubleshooting of #41 (#51)

It has been proposed by others to include it in the readme.md
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markiewb 2020-07-29 21:39:24 +02:00 committed by GitHub
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@ -176,6 +176,13 @@ digraph G {
![display renderer](resources/display.png)
### Troubleshooting
#### Getting "failed to open stream: Permission denied"?
Make sure the target directory is writeable by the user in the Docker container.
Or create a writeable directory first. See [workaround #41](https://github.com/pmsipilot/docker-compose-viz/issues/41#issuecomment-483384999)
## License
The MIT License (MIT)