feat(version): add Go version to version output

main.go

@@ -9,6 +9,7 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"runtime"
 	"strconv"
 	"strings"
 	"text/template"
@@ -154,6 +155,8 @@ func printVersion() {
 		buffer.WriteString(fmt.Sprintf(" (%s)", commit))
 	}
 
+	buffer.WriteString(fmt.Sprintf(", built with %s", runtime.Version()))
+
 	fmt.Println(buffer.String())
 }