v5.0.1

Full Changelog: v2.0.0...v5.0.1

Breaking changes:

• d13890a merge "$.comparison_operator" into "$.binary_operator"
• 6b08e2d rm $.underscore. use $.identifier

Additions:

• 82d664b SPM support
• 8eba3d7 $.binary_operator "as" now accepts $._primary_expression on rhs
• 8faa839 explicitly cast signed int to unsigned
• da9a9ec avoid deref scanner if failed to allocate
• 907beca add ** and **= operators
• 0f3fb65 $.pattern_section parses arbitrary expressions
• 33d37a5 $.variable_statement parses lone setassigns and getassigns