Update third party notice

thirdpartynotice.txt

@@ -11,6 +11,7 @@ are grateful to these developers for their contribution to open source.
 4. lodash (https://github.com/lodash/lodash)
 5. markdown-it (https://github.com/markdown-it/markdown-it)
 6. leetcode-cli (https://github.com/skygragon/leetcode-cli)
+7. unescape-js (https://github.com/iamakulov/unescape-js)
 
 fs-extra NOTICES BEGIN HERE
 =============================
@@ -205,3 +206,31 @@ SOFTWARE.
 
 END OF leetcode-cli NOTICES AND INFORMATION
 ==================================
+
+unescape-js NOTICES BEGIN HERE
+=============================
+
+The MIT License (MIT)
+
+Copyright (c) Ivan Akulov <mail@iamakulov.com> (http://iamakulov.com)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+END OF unescape-js NOTICES AND INFORMATION
+==================================