StyleCI fixes

Author: Shawn Hooper

src/EmailAssertions.php

@@ -40,13 +40,13 @@ public static function assertPlusMailbox(string $expected, $actual): void
         [$localPart] = explode('@', $actual, 2);
         [$mailbox] = explode('+', $localPart, 2);
         PHPUnit::assertSame($expected, $mailbox);
-	}
+    }
 
     public static function assertPlusAlias(string $expected, $actual): void
     {
         PHPUnit::assertIsString($actual);
         [$localPart] = explode('@', $actual, 2);
         [$mailbox, $alias] = explode('+', $localPart, 2);
         PHPUnit::assertSame($expected, $alias);
-	}
+    }
 }