Problem importing ManyToManyField from playhouse.fields in pipenv
Sounds like `pipenv` has an old version of peewee on your computer.

In peewee 3.x `ManyToManyField` has moved into `peewee`, so:

```python
# 3.x
from peewee import ManyToManyField
```

I'm not familiar with `pipenv` but it sounds like it's using an older version of peewee on your computer and the newer 3.x on your server. Thank you. This seemed to be the case for me.
Hey,

recently I am having the problem of being unable to import the ManyToManyField from playhouse.fields on an Ubuntu server where I am using pipenv to manage packages and run python. Namely the command

`from playhouse.fields import ManyToManyField`

will lead to the error:

`ImportError: cannot import name ManyToManyField`

When I am using the same import command on my computer, it works, so this problem might be related to the virtualenvironment of pipenv. However, maybe this is a problem of different versions and you could help me. 
Additionally, the import command `from playhouse.shortcuts import ManyToManyField` works. Could I use this instead of the playhouse.fields entry? Are they the same? Can you tell me, why it might not find the ManyToManyField in the playhouse.fields? I would be grateful for any reference.
Thank you.