enh: accept a milestone number in the update_changes.sh script

Author: oesteban

tools/update_changes.sh

@@ -23,7 +23,10 @@ UPCOMING=$?
 HEADER="$1 ($(date '+%B %d, %Y'))"
 echo $HEADER >> newchanges
 echo $( printf "%${#HEADER}s" | tr " " "=" ) >> newchanges
-echo "" >> newchanges
+
+if [[ "x$2" != "x" ]]; then
+	echo "(\`Full changelog <https://github.com/nipy/nipype/milestone/$2?closed=1>\`__)" >> newchanges
+fi
 
 # Search for PRs since previous release
 git log --grep="Merge pull request" `git describe --tags --abbrev=0`..HEAD --pretty='format:  * %b %s' | sed  's+Merge pull request \#\([^\d]*\)\ from\ .*+(https://github.com/nipy/nipype/pull/\1)+' >> newchanges