remove very old bash file

test/docker/update.sh

@@ -1,9 +0,0 @@
-#! /bin/bash
-
-# update the `tester` image by copying in the latest tendermint binary
-
-docker run --name builder tester true
-docker cp $GOPATH/bin/tendermint builder:/go/bin/tendermint
-docker commit builder tester
-docker rm -vf builder
-