release: update changelog

doc/release.md

@@ -70,21 +70,9 @@ DESTDIR=/tmp/testrel make install
 
 ### current changelog
 
-this is the first release of `vkdt`. the project has been under development for
-quite some years and so this is by no means a 'release early' kind of release.
-
-since there is no previous version, here are a few noteworthy features of this release:
-
-* very fast processing (gui and export use equivalent code path, no preview)
-* video support (both ldr `.mov` and raw `.mlv`)
-* timelapse support
-* keyframe support for majority of parameters
-* support spectral input profiles and dcp
-* drawn masks with pentablet support
-* flexible metadata display
-* script to create css/html only web gallery
-* cr3 support via rawspeed
-* multi-frame image alignment
+this is a bugfix point release: compared to 0.5.0 this:
+* fixes noise profile generation for high-res images (quick fix)
+* fixes thumbnail generation for directories that have not been loaded before
 
 ## diverge branches