Fixed extra spaces in annotated text

[brykneval]

Added check for spaces in annotated text, and accordingly updated start and end index.
Based on data provided on: https://dataturks.com/projects/abhishek.narayanan/Entity%20Recognition%20in%20Resumes I was getting some error due to start and end index containing leading and trailing spaces.

Error:

Could not find an optimal move to supervise the parser. Usually, this means that the model can't be updated in a way that's valid and satisfies the correct annotations specified in the GoldParse. For example, are all labels added to the model? If you're training a named entity recognizer, also make sure that none of your annotated entity spans have leading or trailing whitespace. You can also use the experimental debug-data command to validate your
JSON-formatted training data