[GitHub Actions] Mirror README.md from src/lib.rs

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Automated changes by create-pull-request GitHub action

[github-actions]

Filename                        Stmts    Miss  Cover    Missing
----------------------------  -------  ------  -------  --------------------
src/application.rs                 81      81  0.00%    94-222
src/graph_description.rs          156       0  100.00%
src/macros.rs                       4       0  100.00%
src/running.rs                      4       0  100.00%
src/version.rs                     26       0  100.00%
src/pattern/buffer.rs              21       0  100.00%
src/pattern/io_processor.rs        19      19  0.00%    72-160
src/pattern/reader.rs              29      20  31.03%   57-58, 75-79, 90-130
src/pattern/writer.rs              49      29  40.82%   110-176
src/traits/append_as_line.rs        9       0  100.00%
src/traits/colour_message.rs        8       0  100.00%
src/traits/convert_buffer.rs       21       0  100.00%
src/traits/prefer.rs                3       0  100.00%
src/traits/to_stderr.rs             4       0  100.00%
TOTAL                             434     149  65.67%