tokenizers/tokenizers.cpython-36m-darwin.so, 2): Symbol not found: ____chkstk_darwin 
Hello
I am using jupyter notebook and installed tranformers with:
`!{sys.executable} -m pip install transformers 
`
I have MacOS 10.13
When trying to import the tranformers:
`from transformers import BertTokenizer, BertModel
`
I get the error:
```
ImportError: dlopen(/Users/user1/anaconda3/lib/python3.6/site-packages/tokenizers/tokenizers.cpython-36m-darwin.so, 2): Symbol not found: ____chkstk_darwin
  Referenced from: /Users/user1/anaconda3/lib/python3.6/site-packages/tokenizers/tokenizers.cpython-36m-darwin.so (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib
 in /Users/user1/anaconda3/lib/python3.6/site-packages/tokenizers/tokenizers.cpython-36m-darwin.so
```

Any idea how to fix it?
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