0.24.0

• Fix passing global variable value to function call.
• Support slice with default start and end and optimize it.
• Implement PostgreSQL DISTINCT ON operator.
• Support GROUP BY one or more expression.
• Improve the parse and performance of DESCRIBE query.
• Support PostgreSQL boolean values literals.
• Support query parents_count of commit.
• Support query committer_name and committer_email of commit.
• Rename name and email to author_name and author_email of commit.
• Support commit_conventional function in gitql application.
• Support implicit casting in WHERE statement.
• Support implicit casting in HAVING statement.