chore: changelog entry

Author: Ddystopia

CHANGELOG.md

@@ -14,6 +14,7 @@
 
 - [#51](https://github.com/embedded-graphics/tinybmp/pull/51) Added `RawBmp::colors` method to iterator of the raw color values in a file.
 - [#51](https://github.com/embedded-graphics/tinybmp/pull/51) Added `DynamicRawColors`, `RawColors`, `Rle4Colors`, and `Rle8Colors` iterators.
+- [#52](https://github.com/embedded-graphics/tinybmp/pull/52) Added `Rle{4,8}Colors::next_solid_chunk` that can be used with `fill_solid` for better performance.
 
 ### Changed