update changelog.sh script

Author: ofTheo

scripts/dev/changelog.sh

@@ -1,5 +1,5 @@
 if [ $# -ne 2 ]; then
 	echo Error: wrong number of arguments
-	echo Usage: ./thanks.sh tag1 tag2
+	echo Usage: ./changelog.sh tag1 tag2
 fi
-git log $1...$2 --no-merges --pretty=format:'- %s [commit](https://github.com/openframeworks/openFrameworks/commit/%H)' --reverse | sed 's/^\s*[0-9][0-9]*\s\(.*\)$/- \1/g'
+git log --ancestry-path $1..$2 --no-merges --pretty=format:'- %s [commit](https://github.com/openframeworks/openFrameworks/commit/%H)' | sed 's/^\s*[0-9][0-9]*\s\(.*\)$/- \1/g'