Parsita 2.1.0

This is a quick follow-on to the 2.0.0 release. I neglected to make some methods private that were supposed to be private. Because the 2.0.0 release was only three days ago, I hope this will be fine. This is just a bugfix release for anyone who combines the built-in parsers to make their parsers (most users). But this is a severely breaking change for any custom parsers (inherit from Parser rather than use them).

• Made Parser.consume private
  • Renamed consume to _consume
  • Renamed cached_consume to consume
  • This is the breaking change for custom parsers. Custom parsers now need to override _consume instead of consume and need to call consume instead of cached_consume. This actually brings the 2.x branch a little bit closer to the 1.x branch.
• Renamed StringReader.current_line to _current_line
• Moved Parser.handle_other to a global function
  • Export this function as parsita.parsers.wrap_literal
  • Use wrap_literal for all the parsers, not just the operators
    • Literal wrapping now applies to all non-Parser objects, not just str
    • pred now wraps literals like the other parsers, rather than requiring a proper Parser object