Minor update to docker build

Author: treydock

Dockerfile

@@ -1,6 +1,6 @@
 ARG ARCH="amd64"
 ARG OS="linux"
-FROM quay.io/prometheus/busybox-${OS}-${ARCH}:glibc
+FROM quay.io/prometheus/busybox-${OS}-${ARCH}:latest
 ARG ARCH="amd64"
 ARG OS="linux"
 COPY .build/${OS}-${ARCH}/eseries_exporter /eseries_exporter