add newlines under headlines

hack/scripts/create_changelog.sh

@@ -25,6 +25,7 @@ fi
 
 # Generate the changelog in the CHANGELOG.md.
 echo "## What has changed" >>${CHANGELOG_FILE}
+echo "" >>${CHANGELOG_FILE}
 
 # Iterate over all commits since the previous release.
 git log "${PREVIOUS_RELEASE}"..HEAD --pretty=tformat:"%h" --reverse | while read -r commit; do
@@ -46,6 +47,7 @@ join -v2 \
 # Add new contributors to the 'new contributors' section of the changelog.
 if [ -s ${NEW_CONTRIB} ]; then
 	echo -e "\n## New contributors" >>${CHANGELOG_FILE}
+	echo "" >>${CHANGELOG_FILE}
 	while read -r user; do
 		REF_PR=$(grep "@${user}" ${CHANGELOG_FILE} | head -1 | grep -o " (#[0-9]\+)" || true)
 		if [ -n "${REF_PR}" ]; then #reference found
@@ -57,6 +59,3 @@ fi
 
 # Append link to the full-changelog this changelog.
 echo -e "\n**Full changelog**: https://github.com/$REPOSITORY/compare/${PREVIOUS_RELEASE}...${RELEASE_TAG}" >>${CHANGELOG_FILE}
-
-# Cleanup the NEW_CONTRIB file.
-rm ${NEW_CONTRIB} || true