Fix flake8 violations

[skatsaounis]

This pr solves third requirement of #2

[pep8speaks]

Hello @skatsaounis! Thanks for submitting the PR.

• There are no PEP8 issues in the file example.py !

• There are no PEP8 issues in the file pyblnet/__init__.py !

• There are no PEP8 issues in the file pyblnet/blnet.py !

• There are no PEP8 issues in the file pyblnet/blnet_conn.py !

• There are no PEP8 issues in the file pyblnet/blnet_parser.py !

• In the file pyblnet/blnet_web.py, following are the PEP8 issues :

  Line 210:17: W605 invalid escape sequence '\d' Line 210:33: W605 invalid escape sequence '\d' Line 211:16: W605 invalid escape sequence '\d' Line 260:17: W605 invalid escape sequence '\d'

[skatsaounis]

@nielstron Hi, would you mind if I do not touch the regex at all? The warnings mentioned by @pep8speaks are all inside regex. I believe you should be the one to update it. Flake8 is not complaining about them though.

[nielstron]

That's fine, thank you! I'll look into as as soon as possible.