fix notice

mmasiukevich · mmasiukevich · commit ce1089c3e827 · 2019-12-31T00:03:07.000+03:00
diff --git a/src/Storage/InMemoryCollectionStorage.php b/src/Storage/InMemoryCollectionStorage.php
@@ -57,7 +57,7 @@ public function add(string $key, Lock $lock): void
 
     public function get(string $key): ?Lock
     {
-        return $this->localStorage[$key] ?: null;
+        return $this->localStorage[$key] ?? null;
     }
 
     /**

Original file line number	Diff line number	Diff line change
`@@ -57,7 +57,7 @@ public function add(string $key, Lock $lock): void`
`57`	`57`
`58`	`58`	`public function get(string $key): ?Lock`
`59`	`59`	`{`
`60`		`- return $this->localStorage[$key] ?: null;`
	`60`	`+ return $this->localStorage[$key] ?? null;`
`61`	`61`	`}`
`62`	`62`
`63`	`63`	`/**`