changed dev version to get rid of warning when installing from checkout
changed dev version to get rid of warning when installing from checkout

The warning was:

```
.../crate-python/env/lib/python3.6/site-packages/setuptools/dist.py:333: UserWarning: Normalizing '0.22-dev' to '0.22.dev0'
```

crate/crate-python,crate/crate-python