docs: update changelog

Author: benjGam

CHANGELOG.md

@@ -3,7 +3,8 @@
 - `Added`:
   - `getFirstCharIndex(string: string): number` method has been implemented.
   - `normalizeSentence(sentence: string): string` method has been implemented, this method is used to upper the first word char & lower the rest of them & append a dot at the end of it.
-  - `getPunctuationCharIndex(string: string): number` method has been implemented.
+  - `getFirstCharIndex(string: string)` method has been implemented.
+  - `getFirstEndingPunctuationIndex(string: string): number` method has been implemented.
   - `getIndexOfUnfullyDeterminated(string: string, toSearch: string | string[]): number` method has been implemented to get the first index of a given set of (only one) char in a given string.
 
 # Version 2.4.1