jenojp/negspacy: v0.1.8 pattern modification enhancements, ability to use multiple negspacy instances in a pipeline

• Big thanks to @lcreteig for pull request #20, which allows a user to update the extension name, thus being able to use multiple instances of negspacy in a pipeline:

negex = Negex(nlp, extension_name="myownname")

• Small modifications to make it easier to users to add or remove patterns on the fly:

  nlp = spacy.load("en_core_web_sm")
  negex = Negex(nlp)
  patterns = negex.get_patterns()
  negex.add_patterns(
        pseudo_negations=["my favorite pattern"],
        termination=["these are", "great patterns"],
        preceding_negations=["wow a negation"],
        following_negations=["extra negation"],
    )
  negex.remove_patterns(termination = "but", preceding_negations=["wow a negation"])