CHANGELOG: fix v0.6.3 changelog entry

Signed-off-by: Davide Bettio <davide@uninstall.it>

Author: bettio

CHANGELOG.md

@@ -24,7 +24,7 @@ require depending on default function and bootloader code
 - Support for Elixir `Kernel.min` and `Kernel.max`
 - Support (as stub) for `erlang:error/3` (that is required from Elixir code)
 
-## [0.6.3] - 20-07-2024
+## [0.6.3] - 2024-07-20
 
 ### Added