chore: update CHANGELOG.md

Author: rzvxa

CHANGELOG.md

@@ -16,6 +16,7 @@
 - **.0**:
     - fix: typo in the docs. (bl4kraven) [#1390](https://github.com/preservim/nerdtree/pull/1390)
     - feat: add NERDTreeExplore command. (msibal6) [#1389](https://github.com/preservim/nerdtree/pull/1389)
+    - fix: mapping description in NERDTree.txt. (roccomao) [#1393](https://github.com/preservim/nerdtree/pull/1393)
 #### 7.0
 - **.1**:
     - Fix NERDTreeFind to handle directory case sensitivity. (dangibson) [#1387](https://github.com/preservim/nerdtree/pull/1387)