litedown 0.6

• Added a Markdown rendering option offline to download web resources when this option is set to true, so that the HTML output can be viewed offline (thanks, @TimTaylor, #73). See https://yihui.org/litedown/#sec:offline for more info.

• Added a function get_context() to query the fuse() context such as the input file path or the output format (thanks, @MichaelChirico #67, @vincentarelbundock #70).

• Added a function raw_text() to output raw text content in a code chunk (thanks, @vincentarelbundock, #69).

• Dropped the chunk option ref.label and added a new chunk option fill, which is more general (ref.label = "LABEL" can be achieved by `<LABEL>` inside a chunk). See https://yihui.org/litedown/#sec:option-fill for more information.

• Fixed a bug that fuse() fails to print the error location when the whole input document consists of a single chunk that throws an error (thanks, @kevinushey, yihui/knitr#2387).

• fuse_book() will ignore YAML headers in book chapters except for the index chapter.