docs: fixed changelog.md

Author: Sven Ulrich

CHANGELOG.md

@@ -13,7 +13,6 @@
 #### 1.5.0
 - Using latest typescript version, please check if your environment still works with this version before upgrading!
 - feature: !IMPORTANT methods/properties starting with uppercase are marked deprecated now and will be removed in future versions! Check the deprecated infos
-- feature: added class `$String` for everybody who is facing issues when `String` is used.
 - feature: `String.isNullOrWhiteSpace` accepts null or undefined now
 - chore: Updated packages
 - chore: added linting