Update the link to bronze sponsor picture(closes #897)
Update the link to bronze sponsor picture(closes #897)

apache/incubator-groovy,jwagenleitner/groovy,jwagenleitner/incubator-groovy,shils/groovy,shils/groovy,paulk-asert/incubator-groovy,jwagenleitner/incubator-groovy,jwagenleitner/incubator-groovy,armsargis/groovy,shils/incubator-groovy,paulk-asert/incubator-groovy,armsargis/groovy,shils/incubator-groovy,jwagenleitner/incubator-groovy,apache/incubator-groovy,apache/groovy,shils/groovy,apache/incubator-groovy,jwagenleitner/groovy,shils/incubator-groovy,paulk-asert/groovy,paulk-asert/groovy,apache/incubator-groovy,paulk-asert/incubator-groovy,apache/groovy,paulk-asert/groovy,paulk-asert/incubator-groovy,paulk-asert/incubator-groovy,jwagenleitner/groovy,shils/incubator-groovy,jwagenleitner/groovy,apache/groovy,apache/groovy,shils/groovy,armsargis/groovy,armsargis/groovy,paulk-asert/groovy