pybel-tools should have a new documentation?

[choooze]

Hello guys.

I found that the latest version of 'pybel-tools' impossible to use according to the documentation (https://pybel.readthedocs.io/projects/tools/en/latest/)

For example
`Python 3.8.2 (default, Jul 16 2020, 14:00:26)
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.

import pybel_tools
pybel_tools.get_version()
'0.8.0'
graph = []
pybel_tools.mutation.enrich_complexes(graph)
Traceback (most recent call last):
File "", line 1, in
AttributeError: module 'pybel_tools' has no attribute 'mutation'
dir(pybel_tools)
['builtins', 'cached', 'doc', 'file', 'loader', 'name', 'package', 'path', 'spec', 'get_version', 'version']
`

So hence the following problem, it's impossible to use https://github.com/pybel/pybel-notebooks because it's related on 'pybel-tools' package.