v0.0.12

• Add as_tuples argument in spaCyLayout.pipe, analogous to spaCy's Language.pipe. (#36)
• Add support for document index tables. (#34, @mkessy)
• Fix typos in docs. (#33, @svlandeg)
• Add code snippet for visualizing a page with matplotlib to docs. (#26, @wjbmattingly)
• Add serialization section to docs with note on deserializing with extension attributes.