From fb5b4922287bcfbba7b4b6024e30c6fa7ec58f3b Mon Sep 17 00:00:00 2001
From: Oliver Davies <oliver@oliverdavies.uk>
Date: Fri, 19 Apr 2019 00:36:36 +0100
Subject: [PATCH] Add return type

---
 src/Service/Builder.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Service/Builder.php b/src/Service/Builder.php
index c96878d..0092b7b 100644
--- a/src/Service/Builder.php
+++ b/src/Service/Builder.php
@@ -133,7 +133,7 @@ class Builder
         return sprintf('(%s)', collect($value)->implode($separator));
     }
 
-    private function glue()
+    private function glue(): ?string
     {
         return $this->expanded ? PHP_EOL : null;
     }