Try to fix Go 1.4.

.travis.yml

@@ -5,6 +5,7 @@ services:
   - redis-server
 
 go:
+  - 1.4
   - 1.6
   - 1.7
   - tip

internal/errors/errors.go

@@ -58,7 +58,7 @@ func IsMoved(err error) (moved bool, ask bool, addr string) {
 		return
 	}
 
-	ind := strings.LastIndexByte(s, ' ')
+	ind := strings.LastIndex(s, " ")
 	if ind == -1 {
 		return false, false, ""
 	}