Updated Dockerfile for device-modbus-go

 - add base-build to include gcc to alpine

Signed-off-by: James Gregg <james.r.gregg@intel.com>

Dockerfile

@@ -3,7 +3,7 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-FROM golang:1.9-alpine AS builder
+FROM golang:1.11.2-alpine3.7 AS builder
 
 ENV GOPATH=/go
 ENV PATH=$GOPATH/bin:$PATH
@@ -12,7 +12,7 @@ RUN echo http://nl.alpinelinux.org/alpine/v3.6/main > /etc/apk/repositories; \
     echo http://nl.alpinelinux.org/alpine/v3.6/community >> /etc/apk/repositories
 
 RUN apk update && apk add make && apk add bash
-RUN apk add curl && apk add git && apk add openssh
+RUN apk add curl && apk add git && apk add openssh && apk add build-base
 
 # RUN curl https://glide.sh/get | sh
 # Workaround for the requirement to pin the version of glide to v0.13.1