Requirement fixup for trailing comma after trailing quote (#776)
Fixup for
https://files.pythonhosted.org/packages/74/49/7349527cea7f708e7d3253ab6b32c9b5bdf84a57dde8fc265a33e6a4e662/boto3-1.2.0-py2.py3-none-any.whl:
```
botocore>=1.3.0,<1.4.0',
```
Note that neither the quote nor the comma are right.
