v0.5.0

[mohrez86]

PyLLMut 0.5.0

• Fix computation of docstring start and end lines for Python 3.7, and add a test for _is_docstring_line.
• Fix end_lineno attribute error on Python versions earlier than 3.8.
• Relax openai dependency constraints.
• Remove black dependency and configuration.
• Update minimum supported Python version to 3.7.
• Revise development and documentation dependencies.

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This discussion was created from the release v0.5.0.