Release 2.5.0

This is the last release supporting Python 2.

• maintenance: drop support for Python 3.3 and 3.4, add support for Python 3.8
• maintenance: improve compatibility with the upcoming Python 3.10
• maintenance: automatically build the documentation.
• maintenance: fix mypy errors

Release 2.4.0

• enhancement: load data progressively with generator return_type.
• enhancement: standard Java escape sequences are now decoded in string attributes, and non-printable characters are now encoded with escaping.
• fix: match all possible separator spaces to add quotes when encoding into ARFF. These separator spaces will be preserved when decoding the ARFF files.

Maintenance release 2.3.1

• maintenance: replace two bare raise by appropriate raise Exception statements
• maintenance: avoid deprecation warning in Python >= 3.6

Release 2.3.0

• enh: improvements to loading runtime (issue #76)
• fix: several bugs in decoding and encoding quoted and escaped values, particularly in loading sparse ARFF.
• fix #52: Circumvent a known bug when loading sparse data written by WEKA

Bugfix release 2.2.2

• fix: better support for string and nominal features containing escape characters (issue #69).

Bugfix release 2.2.1

• fix: better support for string features and nominals containing commas (issue # 64)

Bugfix release v2.1.1

Merge pull request #54 from mfeurer/master

Version update, changelog update