Fix broken nextflow config template

#30

mako_templates/config_template.config.template

@@ -5,14 +5,14 @@ tower {
 report {
     enabled = ${ str(output_bucket is None)}
 % if output_bucket is not None:
-    file = "s3://${ output_bucket }/report-${ execution_id.hex }.html
+    file = "s3://${ output_bucket }/report-${ execution_id.hex }.html"
 % endif
 }
 
 timeline {
     enabled = ${ str(output_bucket is None)}
 % if output_bucket is not None:
-    file = "s3://${ output_bucket }/timeline-${ execution_id.hex }.html
+    file = "s3://${ output_bucket }/timeline-${ execution_id.hex }.html"
 % endif
 }