Merge pull request #130 from cucumber/improve-release-doc

Add troubleshooting section to release doc

Author: gaeljw

RELEASING.md

@@ -66,3 +66,19 @@ make release
 ``` 
 
 All done! Hurray!
+
+## Troubleshooting
+
+### Error from Docker
+
+If you encounter the following error:
+```
+Unable to find image 'cucumber/cucumber-build:latest' locally
+docker: Error response from daemon: Get https://registry-1.docker.io/v2/: dial tcp: lookup registry-1.docker.io on [::1]:53: read udp [::1]:38683->[::1]:53: read: connection refused.
+See 'docker run --help'.
+```
+
+You might want to try to download the Docker image by yourself using:
+```sh
+docker pull cucumber/cucumber-build:latest
+```