[Enhancement] comment-changes: Stop at Certain Commit SHA; fixes #336

[kevinmatthes]

This PR fixes #336.

[github-actions]

Filename                               Stmts    Miss  Cover    Missing
-----------------------------------  -------  ------  -------  -----------------------------
src/graphing/agd.rs                      156       0  100.00%
src/graphing/graph.rs                    146       0  100.00%
src/application.rs                        55      55  0.00%    115-209
src/cffreference.rs                       68       0  100.00%
src/macros.rs                              4       0  100.00%
src/running.rs                             4       0  100.00%
src/version.rs                            60       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                     32      21  34.38%   57-58, 75-79, 90-109, 123-140
src/pattern/writer.rs                     75      30  60.00%   133-152, 187-197, 229-257
src/changelog/action.rs                   11       0  100.00%
src/changelog/comment_changes.rs         166     166  0.00%    110-410
src/changelog/fragment.rs                 21       0  100.00%
src/changelog/ronlog.rs                   74      74  0.00%    35-229
src/changelog/section.rs                  48       0  100.00%
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/rusty_object_notation.rs        8       0  100.00%
src/traits/to_stderr.rs                    4       0  100.00%
TOTAL                                   1013     365  63.97%

[kevinmatthes]

I added some explanations on my changes; @AmmarAbouZor, is this implementation okay for your use case (#336)?

[AmmarAbouZor]

@kevinmatthes This should work perfectly in my use case. Thanks for implementing it 🌟