Update CHANGELOG.md

Author: khaled-alshamaa

CHANGELOG.md

@@ -34,7 +34,7 @@
 
 * Add new functionality to normalize digits styles in the arNormalizeText() function by setting the symbol's type used to represent numerical digits (Arabic, Hindu, or Persian). Thanks to [Taha Zerrouki](https://github.com/linuxscout) for his [suggestion](https://github.com/khaled-alshamaa/ar-php/issues/31).
 
-* Add the new "diffForHumans" method to get the difference between 2 timestamps in a human-readable format. Thanks to [Watheq Alshowaiter](https://github.com/WatheqAlshowaiter) for requesting this functionality.
+* Add the new [diffForHumans](https://khaled-alshamaa.github.io/ar-php/classes/ArPHP-I18N-Arabic.html#method_diffForHumans) method to get the difference between 2 timestamps in a human-readable format. Thanks to [Watheq Alshowaiter](https://github.com/WatheqAlshowaiter) for requesting this functionality.
 
 * Improve example scripts by adding anchor links to the internal sections and links to the related reference documentation.