Startup BASh script failling on Linux

Looks like an issue with the alias. Will submit a pull request.

```
$ ./geopython-workshop-ctl.sh start
Using docker-compose
Using docker-compose
./geopython-workshop-ctl.sh: line 35: dockercompose: command not found
./geopython-workshop-ctl.sh: line 36: dockercompose: command not found
./geopython-workshop-ctl.sh: line 33: dockercompose: command not found
```