Fix spacy component example (issue #96)

[iibrahimli]

Update the example to work with the latest spacy as installed by pip install spacy (version 3.0.6), and fix failure to segment sentences due to doc.char_span returning None. Fixes #96.

Add pipe to spacy model Use the current spacy recommended way to add the pipe to a model.

Fix sentences not split due to extra chars The doc.char_span uses alignment_mode="strict" by default, which returns None when sent_char_spans contains trailing spaces, for example. Change the alignment_mode to "contract" so that it returns correct spans.

[sudarshan85]

Why is this not merged yet?

[LifeIsStrange]

@nipunsadvilkar

[bojanstef]

@nipunsadvilkar