Invalid value "20s\r" for flag -timeout

Good day,

When I run my Docker image on a Windows 10 machine, I'm getting the following error:
```
invalid value "20s\r" for flag -timeout: time: unknown unit s
```
Here's how I use `dockerize`:
```sh
dockerize -wait tcp://database:3306 -timeout 20s
```
This line is in a shell run by the Docker file like so:
```
RUN chmod +x start.sh
ENTRYPOINT ./start.sh
```