Added a Feature of Ignoring some number tokens

[dhananjaypai08]

Fixes #5
Ignore parameter right now is for only the parse function(can also implement for parse_number and parse_ordinal once reviewed)
Ignoring parameters present in the ignore list and not parsing it to a number and simply adding it as it is to the output string and then keep building further. Also have added few test cases in test_number_parsing for the same. Let me know what you think and can update the Readme once its approved.

[codecov]

Codecov Report

❌ Patch coverage is 96.15385% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.15%. Comparing base (8367865) to head (4fd5e95).
⚠️ Report is 16 commits behind head on master.

Files with missing lines	Patch %	Lines
number_parser/parser.py	96.15%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #74      +/-   ##
==========================================
+ Coverage   98.78%   99.15%   +0.37%     
==========================================
  Files          86       86              
  Lines         328      356      +28     
  Branches       61       69       +8     
==========================================
+ Hits          324      353      +29     
+ Misses          1        0       -1     
  Partials        3        3              

Files with missing lines	Coverage Δ
number_parser/parser.py	98.89% <96.15%> (+0.53%)	⬆️

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