update acknowledgements

Author: jdneo

ACKNOWLEDGEMENTS.md

@@ -4,3 +4,4 @@ A big thanks to the following individuals for contributing:
 - [@ntt2k](https://github.com/ntt2k) for contributing [#38](https://github.com/jdneo/vscode-leetcode/pull/38).
 - [@purocean](https://github.com/purocean) for contributing [#46](https://github.com/jdneo/vscode-leetcode/pull/46)
 - [@Xeonacid](https://github.com/Xeonacid) for contributing [#58](https://github.com/jdneo/vscode-leetcode/pull/58).
+- [@Himself65](https://github.com/Himself65) for contributing [#61](https://github.com/jdneo/vscode-leetcode/pull/61)