Update `setup.py` to add jinja as dependency for tiptapy

[Pradhvan]

Problem

If the virtual env does not have jinja installed tiptapy throws a dependency error for jinja.

python -m pip install tiptapy

• Traceback

import titapy
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'titapy'
>>> import titapy
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'titapy'
>>> import tiptapy
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/Users/glados/workspace/tiptapy/tiptapy/__init__.py", line 5, in <module>
  from jinja2 import FileSystemLoader, Environment, select_autoescape
ModuleNotFoundError: No module named 'jinja2'

Possbible solution

• jinja can be added as a dependency for tiptapy in setup.py