Fix remaining styleci issue

Author: Corey McCormick

src/SimpleSoftwareIO/QrCode/DataTypes/BTC.php

@@ -124,7 +124,7 @@ protected function buildBitCoinString()
             'amount'    => $this->amount,
             'label'     => $this->label,
             '$message'  => $this->message,
-            'r'         => $this->returnAddress
+            'r'         => $this->returnAddress,
         ]);
 
         $btc = $this->prefix.$this->address.'?'.$query;

tests/DataTypes/BTC.php

@@ -35,7 +35,7 @@ public function test_it_generates_a_valid_btc_qrcode_with_an_address_amount_labe
             [
                 'label'         => 'label',
                 'message'       => 'message',
-                'returnAddress' => 'https://www.returnaddress.com'
+                'returnAddress' => 'https://www.returnaddress.com',
             ]
         ]);