Release notes written from the diffs, not commit subjects

mac/release.sh

@@ -17,17 +17,12 @@ if [ "$(git -C "$root" rev-parse "FETCH_HEAD^{commit}")" != "$(git -C "$root" re
 	exit 1
 fi
 token=$(security find-generic-password -s byre-release -w)
+notes=$(cat "$1")
 
 "$mac/package.sh"
 out=$mac/.build/release/$version
 dmg=byre-$version.dmg
 
-previous=$(git -C "$root" describe --tags --abbrev=0 "$tag^" || true)
-if [ -n "$previous" ]; then
-	notes=$(git -C "$root" log --format='- %s' "$previous..$tag")
-else
-	notes="First release."
-fi
 request=$out/release.json
 plutil -create xml1 "$request"
 plutil -insert tag_name -string "$tag" "$request"