Add version to user agent

client.go

@@ -10,6 +10,7 @@ import (
 	"net/http"
 	"net/url"
 	"strconv"
+	"strings"
 	"time"
 )
 
@@ -71,6 +72,12 @@ var errorMap = map[int]error{
 	523:                            errors.New("Something went wrong on LIFX's end"),
 }
 
+var userAgent string
+
+func init() {
+	userAgent = initUserAgent()
+}
+
 func NewClient(accessToken string, options ...func(*Client)) *Client {
 	var c *Client
 	tr := &http.Transport{
@@ -333,3 +340,12 @@ func (c *Client) stateDelta(selector string, delta StateDelta) (*Response, error
 
 	return resp, nil
 }
+
+func initUserAgent() string {
+	var b strings.Builder
+
+	b.WriteString("lifx-go")
+	b.WriteRune('/')
+	b.WriteString(Version)
+	return b.String()
+}

version.go

@@ -0,0 +1,3 @@
+package lifx
+
+const Version = "0.1.0-pre"