doc: update credits as requested.

doc/credits.dox

@@ -187,7 +187,6 @@ Are the below lists missing your name or something's wrong?
     @ref Platform::AbstractXApplication
 -   **Krzysztof Szenk** ([\@Crisspl](https://github.com/Crisspl)) --- math
     fixes
--   **[\@lacyyy](https://github.com/lacyyy)** -- MSYS package fixes
 -   **Leon Moctezuma** ([\@leonidax](https://github.com/leonidax)) ---
     bugreports, API design direction
 -   **Mandeep Singh Baines** ([\@msbaines](https://github.com/msbaines)) ---

src/Magnum/TextureTools/Atlas.h

@@ -128,7 +128,7 @@ for power-of-two sizes.
 
 @htmlinclude atlas-landfill.svg
 
-* *The Trash Algorithm.* Naming credit goes to [\@lacyyy](https://github.com/lacyyy).
+* *The Trash Algorithm.*
 
 @section TextureTools-AtlasLandfill-usage Example usage