Version (#122)

* 新增Version全局变量

* add test file

Makefile

@@ -1,4 +1,4 @@
-GO ?= go
+GO ?= env CGO_ENABLED=0 go
 
 TESTFOLDER := $(shell $(GO) list ./... | grep -v from-xxx-to-gout-doc|grep -v testdata)
 

version.go

@@ -0,0 +1,3 @@
+package gout
+
+const Version = "v0.0.5-dev-2019-12-09"

version_test.go

@@ -0,0 +1,10 @@
+package gout
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func Test_Version(t *testing.T) {
+	assert.NotEqual(t, len(Version), 0)
+}