### Description of Changes
Closes #  <!-- Issue number this PR addresses. If none, remove this line. -->


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### New Version Info

#### Author's Instructions
- [ ] Derive a new `MAJOR.MINOR.PATCH` version number. Increment the:
    - `MAJOR` version when you make incompatible API changes
    - `MINOR` version when you add functionality in a backwards-compatible manner
    - `PATCH` version when you make backwards-compatible bug fixes
- [ ] Update [CHANGELOG.md](https://github.com/scrooloose/nerdtree/blob/master/CHANGELOG.md), following the established pattern.
#### Collaborator's Instructions
- [ ] Review [CHANGELOG.md](https://github.com/scrooloose/nerdtree/blob/master/CHANGELOG.md), suggesting a different version number if necessary.
- [ ] After merge, tag the merge commit, e.g. `git tag -a 3.1.4 -m "v3.1.4" && git push origin --tags`
