Never completely overwrite readme (#11)

terraform_readme.sh

@@ -27,8 +27,7 @@ for path_uniq in $(echo "${paths[*]}" | tr ' ' '\n' | sort -u); do
       DOCS=$(terraform-config-inspect "$path_uniq")
       perl -i -s0pe 's/(<!-- BEGINNING OF TERRAFORM-DOCS HOOK -->).*(<!-- END OF TERRAFORM-DOCS HOOK -->)/\1\n$replacement\n\2/s' -- -replacement="$DOCS" "$README_PATH"
     else
-      # Assume the entire file is autogenerated. Replace the contents with the new generated docs and add the hook so future changes won't hit this code path
-      echo "<!-- BEGINNING OF TERRAFORM-DOCS HOOK -->" > $README_PATH
+      echo "<!-- BEGINNING OF TERRAFORM-DOCS HOOK -->" >> $README_PATH
       terraform-config-inspect "$path_uniq" >> $README_PATH
       echo "<!-- END OF TERRAFORM-DOCS HOOK -->" >> $README_PATH
       echo "Updating $README_PATH, please git add."