Update to golang v1.2.7, bump tools, add packr2 (#23)

Author: rfay

Dockerfile

@@ -1,13 +1,18 @@
-FROM golang:1.12.1-alpine
-ENV GOLANGCI_LINT_VERSION v1.15.0
-ENV GOTESTSUM_VERSION 0.3.3
+FROM golang:1.12.7-alpine
+ENV GOLANGCI_LINT_VERSION v1.17.1
+ENV GOTESTSUM_VERSION 0.3.5
+ENV PACKR2_VERSION 2.5.2
 
 RUN apk update && apk add git bash build-base curl
 
 RUN curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s -- -b $GOPATH/bin $GOLANGCI_LINT_VERSION
 
 RUN curl -sSL "https://github.com/gotestyourself/gotestsum/releases/download/v$GOTESTSUM_VERSION/gotestsum_${GOTESTSUM_VERSION}_linux_amd64.tar.gz" | tar -xz -C /usr/local/bin gotestsum && chmod +x /usr/local/bin/gotestsum
 
+RUN curl -sSL "https://github.com/gobuffalo/packr/releases/download/v${PACKR2_VERSION}/packr_${PACKR2_VERSION}_linux_amd64.tar.gz" | tar -xz -C /usr/local/bin packr2 && chmod +x /usr/local/bin/packr2
+
+#https://github.com/gobuffalo/packr/releases/download/v2.5.2/packr_2.5.2_linux_amd64.tar.gz
+
 # discussion of various tools at
 # http://blog.ralch.com/tutorial/golang-tools-inspection/
 # https://dominik.honnef.co/posts/2014/12/go-tools/#goreturns