v0.5.0

Notable changes

• option to output with or without breaks by @yshavit in #286 and #291
• read extra positional args as files by @yshavit in #289

Behind the curtain

• use PUSH_LITERAL to simplify grammar by @yshavit in #285
• lots of new tests, including new end-to-end tests

Full Changelog: v0.4.1...v0.5.0