switched to lower case letters to be inline with legacy and other command responses

Author: Webklex

src/Connection/Protocols/ImapProtocol.php

@@ -636,7 +636,7 @@ public function folderStatus(string $folder = 'INBOX', $arguments = ['MESSAGES',
             if ($key === null) {
                 $key = $value;
             } else {
-                $result[$key] = (int)$value;
+                $result[strtolower($key)] = (int)$value;
                 $key = null;
             }
         }

tests/live/FolderTest.php

@@ -364,12 +364,12 @@ public function testStatus(): void {
         $folder = $this->getFolder('INBOX');
         self::assertInstanceOf(Folder::class, $folder);
 
-        $status = $folder->getStatus();
-        self::assertEquals(0, $status['MESSAGES']);
-        self::assertEquals(0, $status['RECENT']);
-        self::assertEquals(0, $status['UNSEEN']);
-        self::assertGreaterThan(0, $status['UIDNEXT']);
-        self::assertGreaterThan(0, $status['UIDVALIDITY']);
+        $status = $folder->status();
+        self::assertEquals(0, $status['messages']);
+        self::assertEquals(0, $status['recent']);
+        self::assertEquals(0, $status['unseen']);
+        self::assertGreaterThan(0, $status['uidnext']);
+        self::assertGreaterThan(0, $status['uidvalidity']);
     }
 
     /**