Incorrect Full Name being returned for Profile Object

[nickhendo]

Describe the bug When creating a Profile object, the full_name attribute can be incorrect.

To Reproduce Steps to reproduce the behavior:

1. Without a sessionid prof = Profile("https://www.instagram.com/atlassian/")
2. print(prof.full_name)
3. See that the name returned is Max Sutton (when creating this issue) instead of Atlassian

Expected behavior Expecting prof.full_name to return Atlassian

Additional context I think the issue is in instascrape.core._mappings._ProfileMapping where full_name is mapped to user_full_name. I'm not sure why this is the case, but if this was just mapped to full_name I believe, after my testing, that this should solve the issue. Happy to PR if need be.

[nickhendo]

Just noticed this happening with the username as well. Added to the PR