update go-kosu-ci image with new required binary

packages/dev-images/ci/go-kosu.Dockerfile

@@ -26,5 +26,8 @@ RUN unzip /tmp/tm.zip
 RUN install tendermint /usr/local/bin
 RUN rm tendermint
 
+# install go-bindata
+RUN go get -u github.com/go-bindata/go-bindata/...
+
 # install golintci
 RUN curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v${GOLINTCI_RELEASE}