doc: Add changelog entry for bids-standard#113

Author: effigies

changelog.d/20241114_165444_effigies.md

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+<!--
+A new scriv changelog fragment.
+
+Uncomment the section that is right (remove the HTML comment wrapper).
+-->
+
+<!--
+### Removed
+
+- A bullet item for the Removed category.
+
+-->
+<!--
+### Added
+
+- A bullet item for the Added category.
+
+-->
+<!--
+### Changed
+
+- A bullet item for the Changed category.
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+-->
+<!--
+### Deprecated
+
+- A bullet item for the Deprecated category.
+
+-->
+### Fixed
+
+- Improve handling of `.bidsignore` files in the web validator.
+  Ignores matching directories but not the files they contained could fail to match.
+  (#113)
+
+<!--
+### Security
+
+- A bullet item for the Security category.
+
+-->