Feat: added removeWords

[JohnCervantes]

Key Changes:

  - Implemented removeWords and added it on transformations.js file
  examples:
  stringzy.removeWords('The quick brown fox jumps over the lazy dog', ['quick', 'lazy'])); //The brown fox jumps over the dog
  stringzy.removeWords('The quick brown fox jumps over the lazy dog', 'lazy')); //The quick brown fox jumps over the dog

  - refactored index (maybe this is not really needed? can revert)

[Samarth2190]

Great Work. Just a one change.
There needs to some error handling for parameters if the user passes them as integer or objects.
I will just modify it a bit.
This is really a good addition

[Samarth2190]

I think we should stick to the older format of index.js, where we were exporting individual functions too. This will allow user to export only the needed function

I'll be making some changes there too.