[Enhancement] Simplify src/changelog/fragment.rs

[kevinmatthes]

No description provided.

[github-actions]

Filename                            Stmts    Miss  Cover    Missing
--------------------------------  -------  ------  -------  ----------------------------------------------
src/macros.rs                          23       5  78.26%   190-194
src/main.rs                             3       3  0.00%    22-24
src/complain.rs                       174      17  90.23%   29-70, 298, 302, 306, 310, 314, 318, 322
src/increment_version.rs              159      28  82.39%   32-48, 123-125, 144, 150-155, 234-235, 252-269
src/application.rs                     65      65  0.00%    32-192
src/running.rs                          8       0  100.00%
src/version.rs                         69       0  100.00%
src/cff/cff_create.rs                 160     160  0.00%    41-302
src/cff/cffreference.rs               104       0  100.00%
src/pattern/writer.rs                 125      51  59.20%   134-139, 146-154, 188-200, 232-262
src/pattern/buffer.rs                  33       0  100.00%
src/pattern/io_processor.rs            56      56  0.00%    73-162
src/changelog/comment_changes.rs      268     268  0.00%    26-449
src/changelog/ronlog.rs               203     138  32.02%   28-267, 333
src/changelog/fragment.rs              88       1  98.86%   109
src/graphing/agd.rs                   228       2  99.12%   355, 377
src/graphing/graph.rs                 219       0  100.00%
src/traits/read_file.rs                56      39  30.36%   54-56, 69-71, 77-100, 105, 112-123, 133-146
src/traits/colour_message.rs           19       0  100.00%
src/traits/prefer.rs                    5       0  100.00%
src/traits/file_formats.rs             25       0  100.00%
src/traits/to_stderr.rs                 6       0  100.00%
src/traits/convert_buffer.rs           30       0  100.00%
src/traits/append_as_line.rs           12       0  100.00%
TOTAL                                2138     833  61.04%