Enhancement Proposal: Plugin "assert_used" config-skip snippet

[marianomartinelli]

I want to propose a little but hopefully useful change (in my opinion) to the docs about B101: assert_used config plugin.

I struggled a while trying to understand why the skip config snippet wasn't working at all in my project, and it turns out that, as my tests were in nested directories, a wildcard was needed as a prefix for the following rule: 'test_*.py'.

Also, as this plugin's skip rule is mainly used for test files, I believe its worth having a working example for newcomers to bandit.
In most cases, tests won't be on the root directory of the project, that's why I propose this change, as it goes hand by hand with real test-scaffolding scenarios.

Thanks for this amazing project!

[ericwb]

LGTM