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Update README.md 

Added note to install netcat before calling wait-for to avoid time out messages.
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anD 2019-10-31 16:36:32 +05:30 committed by Atihinen
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@ -49,3 +49,12 @@ Ironically testing is done using [bats](https://github.com/sstephenson/bats), wh
docker build -t wait-for .
docker run -t wait-for
## Note
Make sure netcat is installed in your Dockerfile before running the command.
```
RUN apt-get -q update && apt-get -qy install netcat
```
https://stackoverflow.com/questions/44663180/docker-why-does-wait-for-always-time-out