Cleanup change log consistency

Author: 197g

CHANGELOG.md

@@ -1,7 +1,7 @@
 ## 1.1.0
 
-- replace the `clamp!` macro with the `clamp` function (https://github.com/image-rs/color_quant/pull/8)
 - Unify with `image::math::nq` as per https://github.com/image-rs/image/issues/1338 (https://github.com/image-rs/color_quant/pull/10)
-  - A new method `lookup` from image::math::nq is added
-  - more references in docs
-  - some syntax improvements and better names for functions borrowed from  `image::math::nq`
+  - A new method `lookup` from `image::math::nq` is added
+  - More references in docs
+  - Some style improvements and better names for functions borrowed from  `image::math::nq`
+- Replace the internal `clamp!` macro with the `clamp` function (https://github.com/image-rs/color_quant/pull/8)