Fix overzealous handling of spaces around square brackets ("[]")

[fhightower]

This is a derivate of #46.

Given:

ioc_fanger.fang('applications. [To')

We expect:

'applications. [To'

We get:

'applications.To'

[git-yogeshkumar]

@fhightower Just a question, have you considered giving support of angle brackets ('<>') for fanging IOCs. Cause my team has observed that there are scenarios where we get an IOC like 1<.>1<.>1<.>1. Of Course we can have this fanging to be strict (basically to avoid any html reformatting, just a thought). I would love to hear your thoughts on this!

[fhightower]

Great idea @git-yogeshkumar, we can do that! We'll make the regex strict enough that it won't reformat any html. I'm tracking this idea in #52 .