Bump build to Go 1.12.4

Author: csstaub

Diff for: .travis.yml

@@ -9,7 +9,7 @@ services:
   - docker
 
 go:
-  - '1.12'
+  - '1.12.4'
 
 deploy:
   - provider: releases

Diff for: Dockerfile

@@ -6,7 +6,7 @@
 # To run ghostunnel from the image (for example):
 #     docker run --rm squareup/ghostunnel --version
 
-FROM golang:1.12-alpine as build
+FROM golang:1.12.4-alpine as build
 
 MAINTAINER Cedric Staub "[email protected]"
 

Diff for: Makefile.dist

@@ -2,7 +2,7 @@
 MKFILE_PATH := $(lastword $(MAKEFILE_LIST))
 CURRENT_DIR := $(patsubst %/,%,$(dir $(realpath $(MKFILE_PATH))))
 
-GO_VERSION ?= 1.12
+GO_VERSION ?= 1.12.4
 XGO_BASE_IMAGE ?= cssx/xgo-${GO_VERSION}
 
 # Current system information

Diff for: README.md

@@ -96,7 +96,7 @@ To run tests:
     make test
 
     # Option 2: run unit & integration tests in a Docker container
-    GO_VERSION=1.12 make docker-test
+    GO_VERSION=1.12.4 make docker-test
 
     # Open coverage information in browser
     go tool cover -html coverage-merged.out