add jq to docker file (#84)

Dockerfile

@@ -14,7 +14,7 @@ RUN cd /go-ethereum && make geth
 # Pull Geth into a second stage deploy alpine container
 FROM alpine:latest
 
-RUN apk add --no-cache ca-certificates curl
+RUN apk add --no-cache ca-certificates curl jq
 COPY --from=builder /go-ethereum/build/bin/geth /usr/local/bin/
 
 EXPOSE 8545 8546 8547 30303 30303/udp