Fix unresolved name: insert_tail()#243
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January 21, 2018 08:56
insert_tail(Head.next, data) --> Head.next.insert_tail(data)
Fixes: $ __flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics__
```
./data_structures/LinkedList/singly_LinkedList.py:14:13: F821 undefined name 'insert_tail'
insert_tail(Head.next, data)
^
1 F821 undefined name 'insert_tail'
```
Also formats the code to be compliant with [PEP8](http://pep8.org).
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Line 15: insert_tail(Head.next, data) --> Head.next.insert_tail(data)
Fixes: $ flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics
Also formats the code to be compliant with PEP8.