`strip()` will not always behave as desired here

using strip() in this case has some issues (using v as sample prefix):

if the version string ends with v (e.g. '1.2.3-dev'), trailing v will be stripped
the first argument to strip is treated as a collection (even though a non-string will raise a TypeError), and all instances of any character in the prefix will be stripped from both ends. Thus:
```
>>> "aaacdsa".strip('ac')
'ds'
>>> 'version-1.2.3-dev'.strip('version-')
'1.2.3-d'
```

Don't have tests exercising this done yet, just saw this issue and logging it for now. No known cases of error in the wild

otakup0pe / avakas