make links to issues in CHANGELOG consistently include octothorpe

CHANGELOG.md

@@ -5,7 +5,7 @@
 
 Release date: *2024-03-21*
 
-Add the functionality to download a GeoJSON file of the currently-visible places ([231](https://github.com/UniStuttgart-VISUS/damast/issues/231)).
+Add the functionality to download a GeoJSON file of the currently-visible places ([#231](https://github.com/UniStuttgart-VISUS/damast/issues/231)).
 Add the option to specify minimum and maximum zoom levels (minZoom, maxZoom, minNativeZoom, maxNativeZoom, see [Leaflet documentation](https://leafletjs.com/reference.html#tilelayer)) to the configuration of map tile layers.
 Fix a bug where it was not possible to drag the last item in a stack somewhere else in the visualization layout ([#233](https://github.com/UniStuttgart-VISUS/damast/issues/233)).
 
@@ -15,13 +15,13 @@ Fix a bug where it was not possible to drag the last item in a stack somewhere e
 Release date: *2024-02-07*
 
 This minor release includes two new features:
-- Add map material that is suitable for screenshots in publications ([224](https://github.com/UniStuttgart-VISUS/damast/issues/224)).
+- Add map material that is suitable for screenshots in publications ([#224](https://github.com/UniStuttgart-VISUS/damast/issues/224)).
   The map material added consists of WebMercator tiles showing only shaded relief ([repository](https://darus.uni-stuttgart.de/dataset.xhtml?persistentId=doi%253A10.18419%252Fdarus-3837)), which are licensed under CC-BY-4.0, and water features from Natural Earth, which are in the public domain.
-- Change the tags view header and filter behavior to match that of the sources view (select all, none, invert; sort by name or evidence count; no selection means no match) ([220](https://github.com/UniStuttgart-VISUS/damast/issues/220)).
+- Change the tags view header and filter behavior to match that of the sources view (select all, none, invert; sort by name or evidence count; no selection means no match) ([#220](https://github.com/UniStuttgart-VISUS/damast/issues/220)).
 
 The release also includes updates to dependency versions, as well as two smaller bugfixes:
 - Resolve an issue with Python API changes that lead to errors in newly-built Docker images ([#221](https://github.com/UniStuttgart-VISUS/damast/issues/221)) by pinning the Docker base image version and using `urllib.parse.urlencode` instead of `werkzeug.urls.url_encode`.
-- Resolve an issue where the switch between the qualitative and quantitative timeline modes did nothing ([222](https://github.com/UniStuttgart-VISUS/damast/issues/222)).
+- Resolve an issue where the switch between the qualitative and quantitative timeline modes did nothing ([#222](https://github.com/UniStuttgart-VISUS/damast/issues/222)).
 
 
 ## v1.2.1