Updated changelog

Author: sadko4u

CHANGELOG

@@ -2,9 +2,6 @@
 * RECENT CHANGES
 *******************************************************************************
 
-=== 0.5.11 ===
-- Reviewed and fixed RGB -> HSL conversion routines
-
 === 0.5.10 ===
 * Updated build scripts.
 * Reviewed generic abgr32_to_bgrff function implementation for Big endian platforms.
@@ -15,6 +12,7 @@
 * Fixed lacking export for SSE2-optimized functions support: fmmod3, fmrmod3, fmmod4, fmrmod4.
 * Added support of AMD Zen 2 architecture for CPU tuning.
 * More careful AVX2 support detection for AMD processors.
+* Fixed improper RGBA to HSLA conversion in rgba_to_hsla routine.
 
 === 0.5.9 ===
 * Updated build scripts that now use tags without prefixes first.