ADD lxml required by scrapper

[olidroide]

Required lxml lib by beautifulSoup parser initialization in https://github.com/chris-greening/instascrape/blob/d1700be941355096dc59376c65769789fcb5fe5e/instascrape/core/_static_scraper.py#L240

Steps to reproduce

1. Clone the repository
2. Copy instascrape/instascrape folder to the root of another project to use it
3. pip3 install from requirements.txt
4. Make a simple profile scrape:

   from instascrape import Profile
   olidroide_profile = Profile('olidroide')
   olidroide_profile.scrape()

5. Appear this error

   Traceback (most recent call last):
   File "/usr/share/pycharm/plugins/python-ce/helpers/pydev/pydevd.py", line 1448, in _exec
   pydev_imports.execfile(file, globals, locals)  # execute the script
   File "/usr/share/pycharm/plugins/python-ce/helpers/pydev/_pydev_imps/_pydev_execfile.py", line 18, in execfile
   exec(compile(contents+"\n", file, 'exec'), glob, loc)
   File "/home/olidroide/python/tests/main.py", line 13, in <module>
   print_hi()
   File "/home/olidroide/python/tests/main.py", line 6, in print_hi
   olidroide_profile.scrape()
   File "/home/olidroide/python/tests/instascrape/core/_static_scraper.py", line 112, in scrape
   self.json_dict = self._get_json_from_source(self.source)
   File "/home/olidroide/python/tests/instascrape/core/_static_scraper.py", line 205, in _get_json_from_source
   self.soup = self._soup_from_html(self.html)
   File "/home/olidroide/python/tests/instascrape/core/_static_scraper.py", line 238, in _soup_from_html
   return BeautifulSoup(html, features="lxml")
   File "/home/olidroide/python/tests/venv/lib/python3.8/site-packages/bs4/__init__.py", line 243, in __init__
   raise FeatureNotFound(
   bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?
   python-BaseException

Issue

44

[chris-greening]

Hey @olidroide thanks so much for bringing this to my attention 😄! lxml is actually already listed on requirements.txt, this was an issue with it not being included on setup.py as a dependency so PyPI wasn't installing it. To avoid an extra external dependency I switched the features='lxml' on BeautifoulSoup instantiations to features='html.parser' so we can have more of a batteries-included approach.

Thanks again for bringing this to my attention! 👍

[olidroide]

oups @chris-greening sorry to add again the requirement ;) great update to fix this issue :+1: thanks for all