Fixed emoji support for python-3.8, added use_emoji from initializer, added custom disabling_notification

[GabrieleCalarota]

fixed emoji and added some more emoji for every level
added support for use_emoji from initializer

added support for disabling notification under certain level

Fixing issue #25

[GabrieleCalarota]

Example of usage:

telegram_handler = TelegramHandler(token='', chat_id='', level=logging.DEBUG,
                                   use_emoji=True, disable_notification_logging_level=logging.WARNING)

Will use emoji, support for logging level up to DEBUG, disabling notification is False, so setting level of disabling notification only in DEBUG and INFO log, from WARNING up to CRITICAL will sound notification.

Also added use_emoji set default value to True

[codecov]

Codecov Report

Merging #26 (9c13f6d) into master (4ac0e5c) will decrease coverage by 7.63%.
The diff coverage is 89.13%.

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
- Coverage   98.36%   90.72%   -7.64%     
==========================================
  Files           4        5       +1     
  Lines         122      151      +29     
==========================================
+ Hits          120      137      +17     
- Misses          2       14      +12     

Impacted Files	Coverage Δ
telegram_handler/TelegramBotQueue.py	75.00% <75.00%> (ø)
telegram_handler/handlers.py	90.90% <94.44%> (-9.10%)	⬇️
telegram_handler/__init__.py	100.00% <100.00%> (ø)
telegram_handler/formatters.py	94.54% <100.00%> (-1.20%)	⬇️

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