Linesep

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- Added `UnicodeNewlineSplitter` for incremental splitting on Unicode line
ending sequences
- Added `ParagraphSplitter` for incremental splitting on blank lines

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- Passing a regular expression separator to a `read_*()` function is now
deprecated, and support will be removed in version 1.0.
- Added `TerminatedSplitter`, `PrecededSplitter`, `SeparatedSplitter`, &
`UniversalNewlineSplitter` classes and `get_newline_splitter()` function for
incremental splitting of strings in chunks
- Drop support for Python 3.6
- Moved documentation from README file to a Read the Docs site

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- Support Python 3.10
- Refine return type annotation on `read_paragraphs()`

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- Added `ascii_splitlines()`, `read_paragraphs()`, and `split_paragraphs()`
functions

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- Now support only Python 3.6 and up (tested through 3.9) and PyPy3
- Add type annotations
- Renamed the "`size`" parameter of the `read_*` functions to `chunk_size`
- Add API documentation to README

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- Remove a `PendingDeprecationWarning` generated in newer versions of Python
3.5 and 3.6
- More testing infrastructure
- PyPy now supported