IOError: [Errno 2] No such file or directory: 'src/_version.py'

```
pip install pyautoversion
auto_version
```
```
/lib/python2.7/site-packages/auto_version/auto_version_tool.py", line 93, in read_targets
with open(target) as fh:
IOError: [Errno 2] No such file or directory: 'src/_version.py'
```
It would seem the `_version.py` file does not exist

edit:
This is where the target project doesn't have that file. Ideally this failure would not occur. Perhaps the default config should not contain any targets at all.